model version to be used for a given inventory reporting year will be
defined in an emissions inventory plan as per paragraph (k).
    (m) For onroad mobile sources, the EPA approves onroad mobile
models for California for transportation conformity purposes and for
use in State Implementation Plans (SIPs). For this

subpart, California must report emissions from onroad mobile sources
using the latest model version approved by the EPA as of January 1 of
the emissions inventory year and may optionally use a newer approved
model. For example, the onroad model approved as of January 1, 2023,
should be used to estimate and report emissions to meet the
requirements in Sec.  51.15(e)(3) for the 2023 reporting year, or the
State could optionally choose to use a model approved by the EPA after
that date.
    (n) Confidential data/Confidential Business Information (CBI).
Emissions data are defined by 40 CFR 2.301(a)(2)(i) and are not
confidential pursuant to 42 U.S.C. 7414(c). The specific data elements
submitted under this subpart all fall within the definition of
emissions data and are therefore not entitled to confidential
treatment. Further, pursuant to 42 U.S.C. 7414(c), the EPA is required
to make emissions data available to the public. Thus, all data elements
submitted under this subpart will not be protected as CBI and will be
made publicly available without further notice to States or the owner/
operator of facilities.
    (o) An owner operator or State reporting on their behalf must
consider the recommendations and requirements of paragraphs (a) through
(f), (n), (p), and (q) of this section when:
    (1) Estimating emissions to determine whether a facility's annual
actual emissions of HAP exceed point source reporting thresholds in
Table 1B to Appendix A of this subpart; and
    (2) When estimating emissions to report to EPA.
    (p) To estimate emissions for pollutant groups (e.g., ``Lead and
compounds'' or ``Nickel and compounds''), an owner/operator or a State
reporting on their behalf should ensure emissions values accurately
reflect the mass of the metal/toxic portion of the group (Lead or
Nickel in these examples) by:
    (1) Using emission factors or source test emission rates without
any adjustments; or
    (2) Accounting for chemical compounds to reflect only the toxic
portion of the pollutant group when estimating emissions based on
material balance or engineering judgement; or
    (3) When no other information is available, assuming the entire
mass of the HAP reported is the toxic portion.
    (q) Some HAP may be measured or have emission factors for a
pollutant group as well as for individual compounds within the group.
An owner/operator or a State reporting on their behalf must report the
most detailed pollutants available preferentially over pollutant
groups. When the detailed pollutants do not comprise the total mass of
the pollutant group, the remaining portion of mass for the pollutant
group must be reported as implemented in the electronic reporting
approach (as described by Sec.  51.5(g)). Specific compound groups and
individual pollutants are provided in Tables 1B and 1D to Appendix A of
this subpart.

Sec.  51.10  What criteria determine when facilities must be reported
as point sources?

    (a) For point sources (as defined by Sec.  51.50 of this subpart),
when determining whether emissions data from a facility must be report
as a point source, States and owners/operators must:
    (1) Include total annual actual emissions from all stack and
fugitive release points at the facility; and
    (2) Include emissions from mobile sources as described by Sec.
51.5(b) of this subpart, and in doing so, may exclude emissions from
aircraft and ground support equipment occuring at the facility.
    (b) For point sources associated with emission inventories required
by Part 51 Subpart G, Subpart X, Subpart Z, Subpart AA, Subpart CC,
States must interpret the definition of point sources (as per Sec.
51.50 of this subpart) as follows:
    (1) Use only the criteria of Table 1A to Appendix A of this subpart
in assessing the definition;
    (2) For Subpart G, the reporting threshold applies for oxides of
nitrogen (NOX);
    (3) For Subparts X, AA, and CC, the reporting thresholds apply for
NOX, carbon monoxide (CO), and volatile organic compounds
(VOC); and
    (4) For Subpart Z, the reporting thresholds apply for Nox, CO, VOC,
sulfur dioxide (SO2), ammonia (NH3), total
particulate matter whose aerodynamic diameter is 2.5 microns or less
(PM2.5), and total particulate matter whose aerodynamic
diameter is 10 microns or less (PM10).
    (c) If EPA finalizes revisions to any HAP reporting thresholds
presented in Table 1B to Appendix A of this subpart, only those revised
reporting thresholds published in the Federal Register at least 6
months before the start of an inventory year apply for that inventory
year (e.g., revised thresholds finalized by June 30, 2026, would apply
for the 2026 emissions reports).
    (d) To develop new HAP reporting thresholds for revisions of this
subpart, the EPA would apply the following formula for changes to UREs:
Revised reporting threshold = (Initial threshold in Table 1B to
Appendix A of this subpart x URE in 2022)/Revised URE; and
    (e) To develop new HAP reporting thresholds for revisions of this
subpart, the EPA would apply the following formula for changes to RfCs:
Revised reporting threshold = (Initial threshold in Table 1B to
Appendix A of this subpart x Revised RfC)/RfC in 2022.

Sec.  51.12  What pollutants must be reported for point sources?

    (a) Criteria air pollutants and precursors. For the purposes of
reporting emissions data for this subpart, criteria pollutants and
precursors are CO, NOX, VOC, SO2, NH3,
total PM2.5, total PM10, Pb, and either
condensable PM (when emitted by the facility), or filterable
PM2.5. When the facility potential to emit of any such
pollutant is greater than or equal to the reporting thresholds listed
in Table 1A to Appendix A of this subpart, all such pollutants must be
reported.
    (b) Hazardous air pollutants.
    (1) For major point sources, reported HAP must include all HAP as
listed in section 112(b)(1) of the Clean Air Act, 42 U.S.C. 7412(b)(1),
and 40 CFR 63.64(a).
    (2) For point sources other than major sources, reported HAP must
include any pollutant listed in Table 1B to Appendix A of this subpart
when the annual actual emissions of that pollutant or pollutant group
is greater than or equal to the HAP reporting threshold (presented in
Table 1B to Appendix A of this subpart).
    (c) Incidental criteria air pollutants or precursors. If a facility
meets the point source definition of Sec.  51.50 because of the
facility HAP emissions but does have PTE or actual emissions of
criteria pollutants or precursors exceeding the reporting thresholds of
Table 1A to Appendix A of this subpart, emission reports for that
facility must include incidental criteria pollutants or precursors as
listed in the ``Associated CAPs'' columns Tables 1B and 1D to Appendix
A of this subpart.

Specific Reporting Requirements for State Reporters

Sec.  51.15  What data does my State need to report to EPA?

    State annual and triennial requirements are included in paragraphs
(a) through (f) of this section, with the first inventory year for each
requirement included in Sec.  51.20. At a State's option, a State may
report other emissions data described by paragraphs (g) through (i) of
this section. Requirements on a State for inventories required by 40
CFR

Subparts G, X, Z, AA, and ZZ are included at paragraph (j) of this
section.
    (a) Point sources.
    (1) A State must report the facility inventory and annual actual
emissions of all criteria pollutants and precursors as described by
Sec.  51.12(a).
    (2) If the EPA has approved a HAP reporting application as per
Sec.  51.1(d)(2) of this subpart, a State must report emissions of HAP
consistent with Sec.  51.12(b) and (c) of this subpart. A State may
report one or more HAP voluntarily through the 2025 inventory year and
may not report HAP without an approved application starting with the
2026 inventory year.
    (3) Starting with the 2026 inventory year, a State must report the
facility inventory and daily fuel consumption and associated required
data elements as described in Sec.  51.40 for small generating units
when:
    (i) Hourly or daily emissions and activity data from the unit are
not otherwise reported to the EPA, and
    (ii) The unit was operated to offset electricity demand from the
electricity grid; and
    (iii) The unit is located at a facility that operates on land.
    (4) For electricity generation to offset electricity demand from
the electricity grid, a State need not include any units in their
report when an owner/operator has reported daily or hourly emissions or
activity data directly to the EPA. The unit is located at a facility
that operates on land.
    (5) A State may report additional pollutants not required by Sec.
51.12 of this subpart when supported by the EPA electronic reporting
approaches (as described by Sec. Sec.  51.5(g) and (h) of this
subpart).
    (6) A State must report point source data consistent with the
required data elements described by Sec.  51.40 of this subpart.
    (b) Airports. Airport data includes emissions from aircraft that
occur lower than 3,000 feet above the ground surface (the typical
height considered to be part of the take-off or landing cycle) and
emissions from ground support equipment (GSE). A State must report
stationary sources and qualifying mobile sources as defined by Sec.
51.5(b) (other than aircraft and GSE) at airports as part of Sec.
51.15(a) and report aircraft and GSE data for triennial inventory years
for all airports within a State's implementation planning authority:
    (1) A State must submit activity data (i.e., landings and
takeoffs).
    (2) In lieu of submitting aircraft activity data required by Sec.
51.15(b)(1), a State may instead review EPA-provided data as described
in Sec.  51.5(k) of this subpart, submit comments on that data, and/or
notify the agency that the State accepts these data.
    (3) In addition to Sec.  51.15(b)(1) or (2), a State may
voluntarily submit annual actual emissions of aircraft and GSE for some
or all airports. If submitting annual actual emissions, a State must:
    (i) Use the latest aircraft emissions model specified by the NEI
plan (as described by Sec.  51.5(k) of this subpart);
    (ii) Submit all pollutants estimated by the latest aircraft
emissions model;
    (iii) Submit documentation that describes how the State used the
aircraft emissions model to estimate annual actual emissions and
quality assured the data; and
    (iv) Report aircraft data consistent with the required data
elements described by Sec.  51.40 of this subpart.
    (c) Rail yards. Rail yard data include emissions from yard
locomotive switchers and can include other emissions sources if
present. For triennial inventory years for all rail yards within a
State's implementation planning authority:
    (1) A State must submit activity data and documentation that
explains how the State collected or created the data.
    (2) In lieu of submitting rail yard activity data and documentation
required by Sec.  51.15(c)(1), a State may instead review EPA-provided
data as described in Sec.  51.5(k) of this subpart, submit comments on
that data, and/or notify the EPA that the State accept these values.
    (3) In addition to Sec.  51.15(c)(1) or (2), a State may
voluntarily submit annual actual emissions for some or all rail yards.
If submitting annual actual emissions, a State must:
    (i) Submit all pollutants estimated by the EPA rail yard emissions
method;
    (ii) Submit documentation that describes how the State estimated
rail yard annual actual emissions and quality assured the data; and
    (iii) Report rail yard data consistent with the required data
elements described by Sec.  51.40 of this subpart.
    (d) Nonpoint sources. For triennial inventory years, a State must
report nonpoint sources, including information for all stationary
source emissions not reported as point sources. For reporting purposes,
nonpoint sources include commercial marine vessels and underway
locomotives.
    (1) For this section, ``tool'' refers to any calculation tool,
spreadsheet, or other electronic instrument provided by the EPA for the
purpose of nonpoint source emission calculations.
    (2) A State must complete an online survey in the electronic
reporting approach described in Sec.  51.5(g) to indicate by source
classification code (SCC) for which nonpoint sources a State will
report nonpoint tool input data, accept EPA-provided tool input data,
and/or report annual actual emissions.
    (3) For nonpoint sources with EPA-provided emissions calculation
tools (as described by Sec.  51.5(k)), excluding commercial marine
vessels and locomotives:
    (i) A State must report input data for the nonpoint tools in the
formats provided by EPA; or
    (ii) In lieu of submitting tool inputs, a State may review and
accept EPA-provided nonpoint tool input data; and
    (iii) In addition to Sec.  51.15(d)(3)(i) or (ii), a State may
voluntarily submit annual actual emissions of any pollutants allowed by
the electronic reporting approach (as described by Sec.  51.5(g)).
    (4) For commercial marine vessels and locomotives, a State must
either:
    (i) Report annual actual emissions of pollutants described by Sec.
51.12(a); or
    (ii) Provide comment on EPA-provided annual actual emissions data;
or
    (iii) Accept EPA-provided emissions data.
    (5) For nonpoint sources without the EPA tools:
    (i) A State must report annual actual emissions of pollutants
described by Sec.  51.12(a) of this subpart if the nonpoint source is
not excluded by paragraphs (a) (6) and (8) of this section.
    (ii) A State may report emissions of HAP listed in Table 1B.
    (6) For actual annual emissions reported under Sec.  51.15 (d) (3)
through (5) of this subpart, a State must submit documentation that
describes how the State estimated nonpoint annual actual emissions and
quality assured the data.
    (7) A State should exclude episodic wind-generated emissions from
sources that are not point sources and exclude biogenic sources of
emissions from vegetation and soils.
    (8) A State may exclude nonpoint sources when such sources are
reasonably estimated by the State to represent a de minimus percentage
of total county and State emissions of a given pollutant.
    (9) The EPA nonpoint tools include input data for the entire area
within county boundaries and State waters, including any Indian
country. For paragraphs Sec.  51.15 (d) (3) through (6), a State must
either:
    (i) Include total activity input (inclusive of Indian country) when
reporting nonpoint emissions; or
    (ii) For a State that includes counties overlapping Indian country
for an

Indian Tribe expected to report emissions as per Sec.  51.1(b), the
State must avoid double counting by excluding the activity within and
emissions from Indian country from the county total data reported.
    (10) An Indian tribe that reports nonpoint tool inputs and/or
emissions to meet the requirements of paragraphs (3) through (7) of
this section must report that data separately for each county that
includes Indian country. When an Indian tribe reports nonpoint
emissions, the EPA encourages the tribe to coordinate with the State(s)
and to use EPA-provided tools and include documentation with their
submissions.
    (e) Onroad mobile and nonroad mobile sources. For triennial
inventory years, a State must report onroad mobile and nonroad mobile
data and include information for all onroad and nonroad categories
included in the EPA mobile emissions model, such as the MOVES model.
    (1) A State must provide model inputs to the EPA model. A State
must include at a minimum:
    (i) A county database checklist;
    (ii) Vehicle miles travelled (by county and road type); and
    (iii) Vehicle population (by county, vehicle type, fuel type and
age).
    (2) If a State has relevant data for the inventory year, a State
may optionally provide inputs to the latest EPA-developed mobile
emissions model for the following:
    (i) Hourly average speed distribution by vehicle type, ideally
different for weekday and weekend (distance traveled in miles divided
by the time in hours);
    (ii) Vehicle age distribution;
    (iii) Inspection and maintenance program information; and
    (iv) Documentation that describes how the State created these
inputs and quality assured the data.
    (3) In lieu of submitting model inputs for onroad and nonroad
mobile sources, California:
    (i) Must submit emissions values for the same pollutants estimates
by the EPA model for criteria pollutants and precursors;
    (ii) Must submit documentation that describes the model inputs, use
of the model and any options selected, post-processing steps, and the
quality assurance performed to estimate the emissions; and
    (iii) May submit emissions of HAP, greenhouse gases, and other
pollutants. The EPA urges California to include these other pollutants
when they are estimated by the EPA onroad and nonroad model.
    (iv) Must submit data consistent with the required data elements
described by Sec.  51.40 of this subpart.
    (4) In lieu of submitting any data, States other than California
may review and accept EPA-provided model inputs and emission estimates.
Such States must use the electronic reporting approach provided by the
EPA (as described by Sec.  51.5(g) of this subpart).
    (f) Prescribed fires other than agricultural burning or land
clearance burning. A State must annually report data for any prescribed
burn other than an agricultural burn or land clearance burn that meets
the criteria described by Sec.  51.1(c)(6) of this subpart. The EPA
urges States to coordinate between State environmental agencies and
forestry agencies, and forestry agencies may submit for the State.
    (1) A State must report data consistent with the required and
optional data elements described by Sec.  51.40 and Table 3 to Appendix
A of this subpart and other optional data fields as provided by the EPA
through reporting format instructions.
    (2) For burns that are a combination of broadcast or understory
burns and pile burns, a State must submit separate entries for the
broadcast or understory portion of the burn and for the pile burn.
    (g) Wildfires. A State may report wildfire timing and activity data
using the data elements described by Sec.  51.40 of this subpart. A
State may review and submit comments about EPA-provided emissions and
activity data. The EPA urges States to coordinate between State
environmental agencies and forestry agencies, and forestry agencies may
submit for the State.
    (h) Agricultural Fires. A State may report agricultural fire timing
and activity data using the data elements described by Sec.  51.40(f)
of this subpart. A State may review and submit comments about EPA-
provided emissions and activity data.
    (i) A State may submit sub-annual data to EPA.
    (1) A State may choose to report NOX and VOC summer day
emissions as required by the ozone SIP requirements rules (40 CFR
Subparts, X, AA, or CC) or report CO winter work weekday emissions for
CO nonattainment areas or CO attainment areas with maintenance plans to
the EIS using the data elements described in this subpart.
    (2) A State may choose to report ozone season day emissions of
NOX as required under the NOX SIP Call and summer
day emissions of NOX that may be required under the
NOX SIP Call (40 CFR 51.122) for controlled sources to the
EIS using the data elements described in this subpart.
    (3) A State may choose to report average day emissions of any
pollutants submitted under the PM2.5 SIP Requirements Rule
(40 CFR Subpart Z) to the EIS using the data elements described in this
subpart.
    (j) Inventory requirements for State Implementation Plans required
under Part 51 Subparts G, X, Z, AA, and CC. The following paragraphs
provide specifications that define how a State shall be consistent with
the data elements required as per 40 CFR 51.122(g), Sec. Sec.  51.915,
51.1008 (a)(1)(vi), 51.1115(e), and 51.1315(e).
    (1) Point sources, aircraft and GSE, and railyards. A State must:
    (i) Report sources as point sources as defined by Sec.  51.50 of
this subpart;
    (ii) Meet the requirements of Sec.  51.15(a)(1), limiting reports
to those pollutants required by the SIP; and
    (iii) Compile point source data consistent with the required data
elements described by Sec.  51.40 of this subpart.
    (2) Nonpoint sources. A State must:
    (i) Compile emissions for pollutants required for the SIP using the
required data elements as described by Sec.  51.40 of this subpart;
    (ii) Include any airports (including aircraft and GSE) not reported
as a point source; commercial marine vessels, locomotives, agricultural
burning, prescribed burning, and wildfires;
    (iii) Include all sources of emissions (including biogenic and
geogenic sources) allowing for the provision of Sec.  51.15(d)(8) of
this subpart; and
    (iv) Meet the requirements related to adjacent State land and
Indian country of Sec.  51.15(d) paragraphs (9) and (10) of this
subpart when Indian country is within a nonattainment area.
    (3) Onroad and nonroad. A State must:
    (i) Compile emissions for pollutants required for the SIP rather
than model input data using the required data elements as described in
Sec.  51.40 of this subpart; and
    (ii) Meet the requirements related to adjacent State land and
Indian country described by Sec.  51.15(d) paragraphs (9) and (10) of
this subpart when Indian country is within a nonattainment area. While
Sec.  51.15(d) paragraphs (9) and (10) are for nonpoint sources for the
triennial reporting requirement under this subpart, they apply to
onroad and nonroad sources for the purposes of this paragraph.
    (k) Supporting information. A State must report the data elements
in Tables 2A and 2B to Appendix A of this subpart and other data
required for use

of EPA's electronic reporting approach (as described by Sec.  51.5(g)).
The EPA may ask States to report other data or documentation as needed
to meet special purposes.
    (l) Quality assurance and supporting information. In addition to
the required reporting and documentation described in paragraphs (a)
through (k) of this section, the EPA may ask States to review or revise
data concerns identified through EPA quality assurance. The EPA may ask
States for other data or documentation to support a State submission
when the information provided does not fully explain the source or
quality of the data. Based on the EPA quality review, the EPA may elect
not to use the state-provided data if it does not pass quality
assurance checks or if the State's documentation does not adequately
explain the origin and quality of the submitted data.

Sec.  51.20  When does my State report which information to EPA?

    A State is required to report both annual and triennial emission
inventories to the EPA. The content of these inventories may vary
depending on the inventory year and choices made by a State in
accordance with the provisions of Sec.  51.1(d).
    (a) Annual inventory.
    (1) For the 2023 through 2026 inventory years, a State must report
data for point sources to the EPA (as defined by Sec.  51.15(a) of this
subpart) within 12 months and 15 days of the end of the inventory year
(e.g., for the 2022 inventory year, by January 15, 2024). For 2023
through 2025, this requirement excludes reporting of data for small
generating units consistent with the requirements of Sec.  51.15(a)(3)
of this subpart.
    (2) Starting with the 2026 inventory year, a State is required to
report prescribed fire data (except for agricultural burning and land
clearance burning, as described by Sec.  51.15 (f)) within 6 months
after the end of the inventory year. For example, 2026 data will be due
by July 1, 2027, and then every July 1 thereafter. Prior to the 2026
inventory year, a State may report prescribed burning data or review
EPA-provided data within 6 months after the end of the inventory year.
    (3) A State may report wildfire and agricultural burning data or
review EPA-provided data as identified in Sec.  51.15 (g) and (h) by
the same deadline of Sec.  51.20(a)(2).
    (4) For the 2027 through 2029 inventory years, a State must report
point source data to the EPA (as described by Sec.  51.15(a) of this
subpart) within 9 months after the end of the inventory year (e.g., for
the 2027 inventory year, by September 30, 2028).
    (5) Starting with the 2030 inventory year and for every inventory
year thereafter, a State must report point source data to the EPA (as
described by Sec.  51.15(a) of this subpart) within 5 months after the
end of the inventory year (e.g., for the 2030 inventory year, by May
31, 2031).
    (b) Triennial inventory. In addition to the annual inventory
requirements of Sec.  51.20(a) of this subpart, a State must report
additional data starting with the 2023 inventory year and every
triennial year thereafter (2026, 2029, etc.) by the dates provided
below.
    (1) A State must report airport data (as described by Sec.  51.15
(b) of this subpart) within 9 months after the inventory year, or 60
calendar days after the EPA provides airport data to a State, whichever
is later (i.e., for the 2023 inventory year, by September 30, 2024, or
later).
    (2) A State must report data within 12 months and 15 days after the
end of the inventory year (i.e., for the 2023 inventory year, by
January 15, 2025) for:
    (i) Rail yard sources (as described by Sec.  51.15 (c) of this
subpart);
    (ii) Onroad and nonroad sources (as described by Sec.  51.15 (e) of
this subpart); and
    (iii) Nonpoint emissions for sources without EPA tools (as
described by Sec.  51.15(d)(5) of this subpart).
    (3) A State must submit an online nonpoint survey (as described by
Sec.  51.15(d)(2) of this subpart) within 15 months after the end of
the inventory year (i.e., for the 2023 inventory year, by March 31,
2025).
    (4) A State must submit nonpoint tool inputs (as described by Sec.
51.15(d)(3) of this subpart), within 30 days of the EPA providing tool
inputs to the State, or within the period defined by the EPA at the
time the tool inputs are provided, whichever is longer.
    (5) When a State optionally provides nonpoint emissions for
nonpoint sources with EPA tools (as described by Sec.  51.15(d)(3)(iii)
of this subpart), a State must report such data and documentation (as
described by Sec.  51.15(d)(6) of this subpart) within 60 days of the
EPA providing tool inputs to the State, or within the period defined by
the EPA at the time the tool inputs are provided, whichever is longer.

Specific Reporting Requirements for Owners and Operators of Facilities

Sec.  51.25  What data do owners or operators of facilities within
States need to report to EPA?

    (a) An owner/operator of a facility within a State must report the
facility inventory and annual actual emissions of HAP consistent with
Sec.  51.5 provisions of this subpart for owners/operators, Sec.
51.12(b) and (c) of this subpart, and associated required data elements
(as described by Sec.  51.40 of this subpart) if:
    (1) The facility is in a State that does not have an approved
application (as per Sec.  51.1(d)(1) of this subpart); and
    (2) The facility is a point source as defined by Sec.  51.50 of
this subpart.
    (b) An owner/operator of a point source must report results of
source tests and performance evaluations if:
    (1) Such results are not otherwise reported to the EPA based on
regulations listed at https://epa.gov/electronic-reporting-air-emissions/cedri#list;
    (2) Such results are gathered to meet any other Federal or State
requirement;
    (3) Such results are supported by an EPA electronic reporting
system at the time the test conducted as described in Sec.  51.35 of
this subpart; and
    (4) The tests are not subject to confidential treatment in
accordance with exceptions for emission data provided by 40 CFR 2.301
paragraphs (a)(2)(ii)(A) and (a)(2)(ii)(B).
    (c) Quality assurance and supporting information. The EPA may
require an owner/operator of a point source to review and/or revise
data that do not meet quality assurance criteria. The EPA may require
an owner/operator of a point source to provide other data or
documentation to support their submissions when information provided
does not fully explain the source or quality of the data provided.

Sec.  51.27  What data do owners or operators of other facilities need
to report to EPA?

    (a) An owner/operator of a point source outside the geographic
scope of a States' implementation planning authority is subject to the
requirements of Sec.  51.25(b) and (c) of this subpart.
    (b) An owner/operator of a point source outside the geographic
scope of a States' implementation planning authority must:
    (1) Report the facility inventory and annual actual emissions of
criteria pollutants, precursors, and HAP consistent with Sec.  51.5
provisions for owners/operators, Sec.  51.12(a) through (c) of this
subpart and associated required data elements as described in Sec.
51.40 of this subpart;

    (2) Report the facility inventory and daily fuel consumption and
associated required data elements as described in Sec.  51.40 for small
generating units when:
    (i) Hourly or daily emissions and activity data from the unit are
not otherwise reported to the EPA;
    (ii) The unit was operated to offset electricity demand from the
electricity grid; and
    (iii) The unit is located at a facility that operates on land.
    (3) For portable facilities operating across State and/or Indian
country boundaries, report the facility inventory and the portion of
annual emissions not reported by those States and/or tribes.
    (c) For owners/operators of offshore facilities subject to Title V
emissions reporting and/or emissions quantification requirements,
owners/operators should use approaches consistent with those permits to
identify the emissions sources of such facilities and to estimate and
submit emissions data.
    (d) An owner/operator of a facility subject to the requirements of
40 CFR 49.138 that also meets the point source definition of this
subpart is still required to report in accordance with this subpart
except that such facilities:
    (1) Are exempt from the requirements of this subpart to report
emissions of those pollutants which are reported under 40 CFR 49.138,
and
    (2) May at the option of the owner/operator, report those exempt
pollutants to the EPA electronic reporting system described in Sec.
51.5(h) of this subpart.

Sec.  51.30  When do owners or operators of facilities need to report
data to EPA?

    (a) Optional reporting for 2024 and 2025. For the 2024 and 2025
emissions inventory years, an owner/operator of a point source has the
option to complete submission of data in accordance with Sec. Sec.
51.25(a) and 51.27(b) through (d) of this subpart within 6 months after
the end of the inventory year. The first date for meeting this optional
reporting approach is May 31, 2025, for the 2024 inventory year.
    (b) Mandatory reporting for 2025. For the 2025 emissions inventory
year, an owner/operator of a point source within Indian country must
complete submission of data in accordance with Sec. Sec.  51.25(a) and
51.27(b) through (d) of this subpart by May 31, 2026.
    (c) Mandatory reporting for 2026. For the 2026 emissions inventory
year, an owner/operator of a point source reporting under this subpart
directly to the EPA must complete submission of data required by
Sec. Sec.  51.25(a) and 51.27(b) through (d) of this subpart by May 31,
2027.
    (d) Mandatory reporting for 2027 and subsequent years. Starting
with the 2027 emissions inventory year and every year thereafter, an
owner/operator of a point source reporting under this subpart directly
to the EPA must complete submission of data required by Sec. Sec.
51.25(a) and 51.27(b) through (d) of this subpart within 3 months after
the inventory year. The first date for meeting this requirement is
March 31, 2028, for the 2027 inventory year.
    (e) Owners/operators conducting performance tests and performance
evaluations that meet the requirements of Sec.  51.25(b) of this
subpart must report results from all such tests electronically to the
EPA using approaches required by Sec.  51.35 of this subpart. Test
results conducted on and after the effective date of the final rule
must be reported by:
    (1) The earliest scheduled reporting date for any form of reporting
(electronic or otherwise) as required by the Federal or State action
motivating the measurements; or
    (2) If no scheduled date exists, within 60 days of completing the
measurements.

Sec.  51.35  How do owners or operators of a facility report emissions,
source test, and performance evaluation results?

    For purposes of this section, the terms ERT and CEDRI mean ERT and
CEDRI or analogous electronic reporting approaches provided by the EPA,
as per Sec.  51.5(i).
    (a) Performance Tests and Performance Evaluations. Owners or
operators of facilities must submit performance test and performance
evaluation data following the procedures specified in paragraphs (a)(1)
through (3) of this section. Section Sec.  51.5(i) of this subpart
provides more information on ERT and a list of test methods,
performance evaluations, and pollutants supported.
    (1) Performance Test Methods that are supported by the ERT as
listed on the ERT website at the time the test is conducted. Upload the
ERT project data file or an electronic file consistent with the XML
schema with the appropriate data to CEDRI as a part 51 submission.
    (2) Performance Evaluations of CEMS measuring relative accuracy
test audit (RATA) pollutants that are supported by the ERT as listed on
the ERT website at the time the evaluation is conducted. Submit the
results of the performance evaluation to the EPA via CEDRI. Submit the
data in a file format generated using the ERT. Alternatively, submit an
electronic file consistent with the XML schema listed on the ERT
website.
    (3) Performance Test Methods or Performance Evaluations that are
not supported by the ERT as listed on EPA's ERT website at the time of
the test or evaluation is conducted. The results of the performance
test method or performance evaluation must be included as an attachment
(such as a Portable Document Format (PDF) file) in the ERT or an
alternate electronic file consistent with the XML schema listed on
EPA's ERT website. Submit the ERT-generated package or alternate file
to the EPA via CEDRI.
    (b) Performance Test and Performance Evaluation Submission Content.
In addition to the data required to be submitted in Sec.  51.35(a) of
this subpart, unless otherwise approved by the Administrator in
writing, submit the following elements identified in paragraphs (b)(1)
through (11) of this section. If the elements are not already included
as part of the performance test method or performance evaluation, put
these elements in an attachment (such as a PDF file) in the ERT or an
alternate electronic file consistent with the XML schema listed on
EPA's ERT website. Submit the ERT-generated package or alternate file
to the EPA using CEDRI.
    (1) The capacity of the unit being tested.
    (2) The load of the unit, in terms of percent capacity, during the
testing period.
    (3) The level of activity of the unit during the testing period
(e.g., input consumption rate, product consumption, heat input, and/or
output production rate).
    (4) The operating conditions of the unit during the testing period.
    (5) The process data, such as temperatures, flow rates, pressure
differentials, pertaining to the unit and its control devices during
the testing period.
    (6) General identification information for the facility including a
mailing address, the physical address, the owner or operator or
responsible official (where applicable) and his/her email address, and
the appropriate Federal Registry System (FRS) number for the facility.
    (7) Purpose of the test or evaluation including the applicable
regulation requiring the test (if any), the pollutant(s) and other
parameters being measured, the applicable emission standard (if any),
any process parameter component, and a brief process description.
    (8) Description of the emission unit undergoing testing or
evaluation including fuel burned, control devices, and vent
characteristics; the appropriate source classification code (SCC); the

permitted maximum process rate (where applicable); and the sampling
location.
    (9) Description of sampling or evaluation and analysis procedures
used and any modifications to standard procedures, quality assurance
procedures and results, record of process operating conditions that
demonstrate the applicable test or evaluation conditions are met, and
values for any operating parameters for which limits were being set
during the test or evaluation, as applicable.
    (10) Where a performance test method or performance evaluation
requires you to record or report, the following shall be included in
your submission: Record of preparation of standards, record of
calibrations, raw data sheets for field sampling, raw data sheets for
field and laboratory analyses, chain-of-custody documentation, and
example calculations for reported results.
    (11) Identification of the company conducting the performance test
or evaluation including the company's primary office address, telephone
number, email address, and the name of the company employee who
conducted the test.
    (c) Extensions for CDX/CEDRI Outages. If you are required to
electronically submit a report through CEDRI in the CDX, you may assert
a claim of an EPA system outage for failure to timely comply with that
reporting requirement. To assert a claim of an EPA system outage, you
must meet the requirements outlined in paragraphs (c)(1) through (5) of
this section. The decision to accept the claim of an EPA system outage
and allow an extension to the reporting deadline is solely within the
discretion of the Administrator.
    (1) You must have been or will be precluded from accessing CEDRI
and submitting a required report within the time prescribed due to an
outage of either the CEDRI or CDX systems.
    (2) The outage must have occurred within the period beginning five
business days prior to the date that the submission is due. The outage
may be planned or unplanned.
    (3) You must submit notification to the Administrator in writing as
soon as possible following the date you first knew, or through due
diligence should have known, that the event may cause or has caused a
delay in reporting.
    (4) You must provide to the Administrator a written description
identifying:
    (i) The date(s) and time(s) when CDX or CEDRI was accessed, and the
system was unavailable;
    (ii) A rationale for attributing the delay in reporting beyond the
regulatory deadline to an EPA system outage;
    (iii) A description of measures taken or to be taken to minimize
the delay in reporting; and
    (iv) The date by which you propose to report, or if you have
already met the reporting requirement at the time of the notification,
the date you reported.
    (5) In any circumstance, the report must be submitted
electronically as soon as possible after the outage is resolved.
    (d) Extensions for Force Majeure Events. If you are required to
electronically submit a report through CEDRI, you may assert a claim of
force majeure for failure to timely comply with that reporting
requirement. To assert a claim of force majeure, you must meet the
requirements outlined in paragraphs (d)(1) through (4) of this section.
    (1) You may submit a claim if a force majeure event is about to
occur, occurs, or has occurred or there are lingering effects from such
an event within the period beginning five business days prior to the
date the submission is due. For the purposes of this section, a force
majeure event is defined as an event that will be or has been caused by
circumstances beyond the control of the affected facility, its
contractors, or any entity controlled by the affected facility that
prevents you from complying with the requirement to submit a report
electronically by the due date. Examples of such events are acts of
nature (e.g., hurricanes, earthquakes, or floods), acts of war or
terrorism, or equipment failure or safety hazard beyond the control of
the affected facility (e.g., large scale power outage).
    (2) You must submit notification to the Administrator in writing as
soon as possible following the date you first knew, or through due
diligence should have known, that the event may cause or has caused a
delay in reporting.
    (3) You must provide to the Administrator:
    (i) A written description of the force majeure event;
    (ii) A rationale for attributing the delay in reporting beyond the
regulatory deadline to the force majeure event;
    (iii) A description of measures taken or to be taken to minimize
the delay in reporting; and
    (iv) The date by which you propose to report, or if you have
already met the reporting requirement at the time of the notification,
the date you reported.
    (4) In any circumstance, the reporting must occur as soon as
possible after the force majeure event occurs.
    (5) The decision to accept the claim of force majeure and allow an
extension to the reporting deadline is solely within the discretion of
the Administrator.
    (e) Recordkeeping. Any records required to be maintained by this
subpart that are submitted electronically via EPA's CEDRI may be
maintained in electronic format. This ability to maintain electronic
copies does not affect the requirement for facilities to make records,
data, and reports available upon request to a State or the EPA as part
of an on-site compliance evaluation. For a minimum of 5 years after a
performance test or performance evaluation is conducted, an owner/
operator must retain and make available upon request, for inspection by
the Administrator, the records or results of such performance test or
performance evaluation and other data needed to determine emissions
from a source.

Additional Specifications for Emission Reports

Sec.  51.40  In what form and format should emissions data be reported
to EPA?

    (a) General. A State or owner/operator reporting annually or
triennially under this subpart must report the required data elements
described in this section using the formats required by the EPA
electronic data collection approaches described in Sec.  51.45 of this
subpart. A State or owner/operator must use reporting code values for
certain data elements consistent with Sec.  51.5(j) of this subpart.
Because electronic reporting technology changes over time, the EPA
provides the latest reporting format information and reporting codes on
the EPA websites referenced in Sec.  51.5 of this subpart.
    (b) Point sources.
    (1) A State or owner/operator (unless the facility is eligible for
and elects to comply with reporting as provided in Sec.  51.40(b)(3))
must:
    (i) Report facility inventory data for the data elements listed in
the ``point'' column in Table 2A to Appendix A of this subpart;
    (ii) Report emissions data for the data elements listed in the
``point, airports, railyards'' column in Table 2B to Appendix A of this
subpart;
    (iii) Use the same unit, process, and release point identifiers for
all pollutants emitted from the same unit, process, and release point
at the facility; and
    (iv) Report daily activity data for small generating units
described by Sec. Sec.  51.15(a)(3) and 51.27(b)(2) of this subpart
using the data elements listed in Table 2C to Appendix A of this
subpart.
    (2) An owner/operator of a facility (or a State reporting on their
behalf) is eligible to use the alternative reporting

approach of Sec.  51.40(b)(3) for a facility when:
    (i) The owner/operator is a small entity (as defined by Sec.  51.50
of this subpart);
    (ii) The owner/operator of the facility has never been notified
that the EPA has modeled a cancer risk for that facility of 20/million
or more, or the EPA has made such a notification less than 180 days
prior to the next point source emissions reporting deadline as per
Sec.  51.20 for owners/operators reporting to a State and as per Sec.
51.30 for owners/operators reporting to EPA; and
    (iii) Estimates of more detailed emissions are not required by a
State.
    (3) An owner/operator of a facility (or a State reporting on their
behalf) meeting the conditions of Sec.  51.40(b)(2) may, as an
alternative to the reporting requirements of Sec.  51.40(b)(1) report
as follows:
    (i) Report facility inventory data for the data elements required
as per the ``point (small entity)'' column in Table 2A to Appendix A of
this subpart; and
    (ii) Report emissions data for the data elements required as per
the ``point (small entity)'' column in Table 2B to Appendix A of this
subpart.
    (c) Airports and rail yards. The EPA provides default data tables
(e.g., a spreadsheet) for a State to use (as described by Sec.  51.5(k)
of this subpart).
    (1) To meet the requirement of Sec. Sec.  51.15(b)(1) or (2) and
51.15(c)(1) or (2) of this subpart, a State must use the data tables
provided by the EPA to submit data in an electronic format.
    (2) For a State that optionally reports emissions and documentation
for these sources, the State must:
    (i) Report facility inventory data elements using the data elements
as described by Table 2A to Appendix A of this subpart.
    (ii) Report aircraft and rail yard source emissions using the data
elements as described by Table 2B to Appendix A of this subpart.
    (d) Nonpoint sources. The EPA provides default data tables (e.g.,
tools or spreadsheet) for a State to use for some nonpoint sources as
described by Sec.  51.5(k) of this subpart.
    (1) For nonpoint sources with EPA tools/spreadsheets excluding
commercial marine vessels and locomotives (as described by Sec.
51.15(d)(3), a State must use (i.e., review and/or edit and submit
online) the data tables provided.
    (2) For a State that reports nonpoint actual emissions and
documentation voluntarily or to meet a requirement of Sec.  51.15(d),
the State must report nonpoint sources using the data elements listed
in Table 2B in Appendix A of this subpart. Documentation must be
submitted in one of the formats supported by the electronic reporting
system described by Sec.  51.5(g).
    (e) Onroad and nonroad sources.
    (1) For a State submitting MOVES inputs, the State must use MOVES
input formats for the version of MOVES and meet other requirements for
electronic submission for a given inventory year (as described by Sec.
51.5(l)).
    (2) When California reports emissions to comply with Sec.
51.15(e)(3), the State must report data and documentation to comply
using the data elements listed in Table 2B in Appendix A of this
subpart. Documentation must be submitted in one of the formats
supported by the electronic reporting approach (as described by Sec.
51.5(g)).
    (f) Prescribed burning, wildfires, and agricultural. When reporting
required and/or optional data for fires, a State must report data using
the data elements listed in Table 3 in Appendix A of this subpart. The
same format is used for both the mandatory data (prescribed burning
except for agricultural burning or land clearance burning) and the
voluntary data (wildfires and agricultural burning).

Sec.  51.45  How should States and owners/operators report the data
required by this subpart?

    (a) A State must submit required annual actual emissions and
related data and documentation to comply with Sec.  51.15 of this
subpart to the EPA through the EIS or a comparable electronic reporting
approach provided by the EPA (as described by Sec.  51.5(g) of this
subpart).
    (b) An owner/operator must submit annual actual emissions and
related data and documentation to comply with Sec.  51.25(a) or Sec.
51.27(b) of this subpart to the EPA through CAERS or a comparable
electronic reporting approach provided by the EPA (as described by
Sec.  51.5(h) of this subpart).
    (c) An owner/operator must submit source test and performance
evaluation data and documentation to comply with Sec.  51.25(b) of this
subpart to the EPA through CEDRI or a comparable electronic reporting
approach provided by the EPA (as described by Sec.  51.5(i) of this
subpart).

Sec.  51.50  What definitions apply to this subpart?

    Aircraft engine type means a code defining a unique combination of
aircraft and engine used as an input parameter for calculating
emissions from aircraft.
    Activity data means data needed to calculate emissions using an
emission factor or emissions calculation tool. Activity data varies
depending on the emissions calculation approach and therefore the
emissions source. Examples of activity data include fuel consumed for
combustion emissions, landing and takeoff data for airport emissions,
acres burned, material used for solvent evaporation emissions, and
vehicle miles traveled for onroad mobile source emissions.
    Actual emissions means (for the purposes of this subpart) the
emissions of a pollutant from a source that is required to be reported
under this rule, determined by accounting for actual emission rates
associated with normal source operation and actual or representative
production rates (i.e., capacity utilization and hours of operation).
Actual emissions include emissions of a pollutant that occur during
periods of startup, shutdown, and may include malfunctions. Since
malfunctions are, by nature, unpredictable and given the myriad
different types of malfunctions that can occur, malfunction emissions
are difficult to estimate. However, to the extent that malfunctions
become a regular and predictable event, then such emissions should be
quantified with regular and predictable emissions and included in
actual emissions.
    Agency regulation description means the description of the State,
local, or tribal regulation when reporting a regulation for which no
code is available for reporting in EIS.
    Agricultural burn means the use of a prescribed fire to burn crop
residue.
    Annual emissions means actual emissions for a facility, point, or
process that are measured or calculated to represent a calendar year.
    Air pollutants means criteria pollutants and their precursors, and
hazardous air pollutants.
    Aircraft engine type code means a code that defines the engine
aircraft type for reporting airport emissions to EIS.
    Broadcast burn means a prescribed burning event for which the
biomass is burned in place, as opposed to being collected for a pile
burn. Broadcast burning can include cuttings from fuels reduction
treatments and logging slash that are not piled.
    Combined Air Emissions Reporting System (CAERS) means the
electronic reporting interface developed by the EPA to enable facility
reporting to multiple EPA and State emissions reporting programs.
    CDX means EPA's central data exchange, a system used for many
electronic environmental data submissions to the U.S. EPA.

    CEDRI means Compliance and Emissions Data Reporting Interface, a
data collection system used by the EPA to collect electronic
performance test reports, notification reports, and periodic reports.
    CEMS means continuous emissions monitoring system, which is the
total equipment necessary for the determination of a concentration or
emission rate emitted from a source.
    Control identifier means a unique code for a facility that
identifies a control device, process specialization, or operational
practice used to reduce emissions (e.g., wet scrubber, low
NOX burner, flaring, process change, ban).
    Control measure code means an EIS code used to specify the type of
control measure.
    Control measure percent pollutant reduction efficiency means the
percent reduction achieved for the pollutant when the control measure
is operating as designed.
    Control percent effectiveness means an estimate of the portion of
the reporting period's activity for which the control device was
operating as designed (regardless of whether the control device is due
to rule or voluntary).
    Control pollutant code means the pollutant code for the pollutant
associated with a control measure that has emissions changes caused by
the control measure.
    Control status code means the EIS code that identifies the
operating status of the facility site (e.g., operating, temporarily
shut down, permanently shut down).
    Control status year means the first inventory year for which the
reported control status code applies.
    Emission calculation method means the code describing how the
emissions for a pollutant were calculated, e.g., by stack test,
continuous emissions monitor, EPA emission factor, etc.
    Emission factor means the ratio relating emissions of a specific
pollutant to an activity throughput level.
    Emission operating type means the operational status of an
emissions unit for the time period for which emissions are being
reported, i.e., Routine (including Startup/Shutdown), Malfunction.
    Emission process identifier means a unique code for the process
generating the emissions.
    Emissions year means the calendar year for which the emissions
estimates are reported.
    ERT means the Electronic Reporting Tool.
    Facility air centroid coordinates means a latitude-longitude using
the WGS84 or NAD83 datum that maps to or near the centroid of the air
emissions activities at a facility.
    Facility attributes means the components of a facility including
facility characteristics (e.g., name, address, latitude/longitude),
emissions units and their properties (e.g., identification codes, name,
capacity), emissions release points and their properties (e.g., stack
identification code, fugitive release identification code, release
point height, release point latitude/longitude, release point width or
diameter), emissions processes and their properties (e.g., process
identification code, source classification code), and emissions
controls and their properties (e.g., control identification code,
control method type).
    Facility inventory means the compilation of data about facility
attributes for all facilities included in the national emissions
inventory data repository.
    Facility site identifier means the unique code for a plant or
facility treated as a point source, containing one or more pollutant-
emitting units. The EPA's reporting format allows for State submittals
to use either the State's data system identifiers or EPA's EIS
identifiers.
    Facility site name means the name of the facility.
    Facility site status code means the EIS code that identifies the
operating status of the facility site (e.g., operating, temporarily
shut down, permanently shut down).
    Facility site status year means the first inventory year for which
the reported facility site status code applies.
    Facility source category code means the EIS code that indicates the
Clean Air Act stationary source designation (e.g., major for criteria
pollutants and precursors, major for HAP, non-major).
    Federal waters means those waters over the ``outer Continental
Shelf'' as defined in the Outer Continental Shelf Lands Act (43 U.S.C.
1331(a)).
    Fugitive release midpoint latitude means the measure of the angular
distance on a meridian north or south of the equator.
    Fugitive release midpoint longitude means the measure of the
angular distance on a meridian east or west of the prime meridian.
    Incidental criteria air pollutant or precursor means a criteria
pollutant or precursor emitted from a facility that meets the point
source reporting definition for emissions of HAP but not for emissions
of criteria pollutants and precursors.
    Indian country means Indian country as defined by 18 U.S. Code
1151.
    Land clearance burn means the use of a prescribed fire to burn
vegetation debris resulting from land clearing projects for property
development and right of way maintenance.
    Lead (Pb) means elemental Pb or as a chemical compound containing
Pb, which should be reported as the mass of the Pb atoms only.
    Mobile source means a motor vehicle, nonroad engine or nonroad
vehicle, where:
    (a) A motor vehicle is any self-propelled vehicle designed for
transporting persons or property on a street or highway;
    (b) A nonroad engine is an internal combustion engine (including
the fuel system) that is not used in a motor vehicle or a vehicle used
solely for competition, or that is not subject to standards under
sections 111 or 202 of the CAA; and
    (c) A nonroad vehicle is a vehicle that is powered by a nonroad
engine and that is not a motor vehicle or a vehicle used solely for
competition.
    NAICS means North American Industry Classification System code. The
NAICS codes are U.S. Department of Commerce's codes for categorizing
businesses by products or services and have replaced Standard
Industrial Classification codes.
    NAICS type means whether the reported NAICS is a primary,
secondary, tertiary, etc. NAICS code.
    Nitrogen oxides (NOX) means nitrogen oxides (NOX) as
defined in 40 CFR 60.2 as all oxides of nitrogen except N2O.
Nitrogen oxides should be reported on an equivalent molecular weight
basis as nitrogen dioxide (NO2).
    Nonpoint sources collectively represent individual sources that
have not been inventoried as specific point or mobile sources and are
compiled as a county total. The individual sources treated collectively
as nonpoint sources are typically too small, numerous, or difficult to
inventory using the methods for the other classes of sources.
    Nonpoint survey means the form within the electronic reporting
approach described in Sec.  51.5(g) that is used by States to specify
the use of State and/or EPA data for each nonpoint source type.
    Particulate matter (PM) is a criteria air pollutant. For the
purpose of this subpart, the following definitions apply:
    (a) Filterable PM2.5 or Filterable PM10: Particles that are
directly emitted by a source as a solid or liquid at stack or release
conditions and captured on the filter of a stack test train. Filterable
PM2.5 is particulate matter with an aerodynamic diameter
equal to or less than 2.5 micrometers. Filterable PM10 is
particulate matter with an aerodynamic

diameter equal to or less than 10 micrometers.
    (b) Condensable PM: Material that is vapor phase at stack
conditions, but which condenses and/or reacts upon cooling and dilution
in the ambient air to form solid or liquid PM immediately after
discharge from the stack.
    (c) Primary PM2.5: The sum of filterable PM2.5 and
condensable PM.
    (d) Primary PM10: The sum of filterable PM10 and
condensable PM.
    (e) Secondary PM: Particles that form or grow in mass through
chemical reactions in the ambient air well after dilution and
condensation have occurred. Secondary PM is usually formed at some
distance downwind from the source. Secondary PM should not be reported
in the emission inventory and is not covered by this subpart.
    Percent control approach effectiveness means the percentage of time
or activity throughput for a nonpoint source that a control approach is
operating as designed, including the capture and reduction devices.
This percentage accounts for the fact that controls typically are not
100 percent effective because of equipment downtime, upsets and
decreases in control efficiencies.
    Percent control approach penetration means the percentage of a
nonpoint source category activity that is covered by the reported
control measures.
    Percent control measures reduction efficiency means the nonpoint
source net emission reduction efficiency across all emissions control
measures.
    Percent control reduction efficiency means the point source percent
reduction achieved for the pollutant when all control measures are
operating as designed.
    Percent control release point apportionment means the percentage of
a point source exhaust gas stream captured for routing to a set of
control devices.
    Physical address means the location address (street address or
other physical location description), locality name, State, and postal
zip code of a facility. This is the physical location where the
emissions occur; not the corporate headquarters or a mailing address.
    Pile burn means a prescribed fire used to ignite hand or machine
piles of cut vegetation resulting from vegetation or fuel management
activities.
    Point source means a stationary or portable facility that (1) is a
major source under 40 CFR part 70 for any pollutant, or (2) has PTE or
annual actual emissions of pollutants greater than or equal to the
reporting thresholds in Table 1A to Appendix A of this subpart, or (3)
has a primary NAICS code listed in Table 1C to Appendix A of this
subpart and annual actual emissions of pollutants greater than or equal
to the reporting HAP reporting thresholds (presented in Table 1B to
Appendix A of this subpart). In assessing whether emissions levels
exceed reporting thresholds, all provisions of this subpart related to
emissions estimation approaches apply, including Sec. Sec.  51.5 and
51.10 of this subpart.
    Pollutant code means a unique code for each reported pollutant
assigned by the reporting format specified by the EPA for each
inventory year.
    Portable facility means a facility that does not have a fixed
location such as an asphalt plant or portable drilling rig, mobile
offshore drilling units (MODUs), and offshore installation vessels.
    Prescribed burning or prescribed burn means prescribed burning as
defined by 40 CFR 50.1.
    Primary NAICS means the NAICS code that most accurately describes
the facility or supplier's primary product/activity/service. The
primary product/activity/service is the principal source of revenue for
the facility or supplier.
    Process status code means the EIS code that indicates the current
operating status of the process (e.g., operating, temporarily shut
down, or permanently shut down).
    Process status year means the first inventory year for which the
reported process status applies.
    Regulatory code means a unique code that identifies an air
regulation that applies to an emission unit or process.
    Regulation start year means the first year the air regulation
(identified by the regulatory code) reduced emissions from the unit or
process.
    Regulation end year means the last year the air regulation
(identified by the regulatory code) reduced emissions from the unit or
process.
    Release point apportionment control status means Indicator as to
whether the release point apportionment is controlled or uncontrolled.
    Release point apportionment identifier means the release point
identifier to which an emission process is emitting when specifying the
portion of the process emitting to that release point.
    Release point apportionment means the component name used to
describe the intersection between an emissions process and a release
point.
    Release point apportionment percent means the average annual
percent of an emissions process that is vented through a release point.
    Release point apportionment site path means the site path
identifier to apply the release point apportionment percent.
    Release point identifier means a code that uniquely identifies a
release point of emissions at a facility.
    Release point exit gas flow rate means the numeric value of the
flow rate of a stack gas.
    Release point exit gas temperature means the numeric value of the
temperature of an exit gas stream in degrees Fahrenheit.
    Release point exit gas velocity means the numeric value of the
velocity of an exit gas stream.
    Release point height means physical height of a stack or fugitive
release above the surrounding terrain.
    Release point identifier means a unique code for the point where
emissions from one or more processes release into the atmosphere.
    Release point identifier effective date means the date on which an
agency began using the given identifier for the release point object.
    Release point identifier end date means the date on which an agency
stopped using the given identifier for the release point object (if no
value is given for this element, it is assumed the identifier is still
active).
    Release point latitude means the location of a release point, the
measure of the angular distance on a meridian north or south of the
equator.
    Release point length means the length of the release in the North-
South direction as if the angle is zero degrees.
    Release point longitude means the location of a release point, the
measure of the angular distance on a meridian east or west of the prime
meridian.
    Release point stack diameter means the inner physical diameter of a
stack.
    Release point status code means the EIS code that indicates the
current operating status of the release point (e.g., operating,
temporarily shut down, or permanently shut down).
    Release point status year means the first inventory year for which
the reported release point status applies.
    Release point type code means the code for physical configuration
of the release point.
    Release point width means width of the release in the East-West
direction as if the angle is zero degrees.
    Reporting period type means the code describing the time period
covered by the emissions reported, i.e., Annual, 5-month ozone season,
summer day, or winter.
    Sequence number means the number that specifies the order of
control measures and other site paths within a site path.

    Site path means a collection of control devices at a facility that
work in conjunction with each other to reduce emissions from a release
point.
    Site path average percent apportionment means the average percent
of an emissions flow (during a year) that is vented through a control
device (or control path) and provides for specification of venting to
multiple controls and paths operating in parallel.
    Site path identifier means a code unique to a facility that
identifies a site path.
    Site path name means the common name given for a site path (e.g.,
by an owner/operator to label the path with words).
    Site path percent effectiveness means an estimate of the portion of
the reporting period's activity for which the overall control system
was operating as designed (regardless of whether the control devices
are due to a requirement or are voluntary).
    Site path pollutant code means the pollutant code for the pollutant
that is controlled by a site path.
    Site path control measure percent reduction means the percent
reduction achieved for the pollutant when all control measures are
operating as designed.
    Site path definition means a collection of data elements that
identifies the relationship between a path and a control (or a group of
controls, which must include control identifier(s) and/or path
identifier(s), the sequence of the controls via sequence numbers, and
the site path average percent apportionment for each control)
    Small entity means an owner/operator that meets the small business
definition of CAA section 507(c).
    Small entity type means the small business definitions that apply
to an owner/operator responsible for reporting emissions for a given
facility.
    Small generating unit means any boiler, turbine, internal
combustion engine or other unit that combusts fuel on an occasional
basis to generate electricity for the electricity grid or for on-site
use by a facility other than for emergency use.
    Source classification code means a code assigned to an emission
process identifier that describes the equipment, fuel, and/or operation
characteristics of the process that emits air pollutants.
    State and county FIPS code means the system of unique identifiers
in the Federal Information Placement System (FIPS) used to identify
States, counties and parishes for the entire United States, Puerto
Rico, and Guam.
    Throughput means a measurable factor or parameter that relates
directly or indirectly to the emissions of an air pollution source
during the period for which emissions are reported. Depending on the
type of source category, activity information may refer to the amount
of fuel combusted, raw material processed, product manufactured, or
material handled or processed. It may also refer to population, time of
operation, employment, or number of units. Activity throughput is
typically the value that is multiplied against an emission factor to
generate an emissions estimate.
    Understory burn means a prescribed burning event for which the
biomass is burned in place under a forest canopy, as opposed to being
collected for a pile burn. Understory burning can include cuttings from
fuels reduction treatments and logging slash that are not piled
    Unit design capacity means a measure of the size of a point source,
based on the reported maximum continuous throughput or output capacity
of the unit.
    Unit identifier means a unique code for the unit that generates
emissions, typically a physical piece of equipment or a closely related
set of equipment.
    Unit status code means the EIS code that indicates the current
operating status of the unit (e.g., operating, temporarily shut down,
or permanently shut down).
    Unit status year means the first inventory year for which the
reported unit status applies.
    VOC means volatile organic compounds (as defined by 40 CFR 51.100).
    XML means eXtensible Markup Language, which is a simple, text-based
format for representing structured information for documents and data.

Appendix A to Subpart A of Part 51--Tables

 Table 1A--to Appendix A of Subpart A--Reporting Thresholds for Criteria Pollutants and Precursors for Treatment
                                                 as Point Source
----------------------------------------------------------------------------------------------------------------
                                                                 Thresholds for the 2023, 2026, and  subsequent
                                          Thresholds \1\ for                     inventory years
              Pollutant                 2021, 2022, 2024, and  -------------------------------------------------
                                         2025 inventory years          Most areas        Nonattainment areas \2\
----------------------------------------------------------------------------------------------------------------
(1) SO2..............................  >=2,500................  >=100..................  >=100.
                                                                                PM2.5 (Serious) >=70.
(2) VOC..............................  >=250..................  >=100..................  >=100.
                                                                within OTR \3\ >=50....  within OTR \3\ >=50.
                                                                                O3 (Serious) >=50.
                                                                                O3 (Severe) >=25.
                                                                                O3 (Extreme) >=10.
                                                                                PM2.5 (Serious) >=70.
(3) NOX..............................  >=2,500................  >=100..................  >=100.
                                                                                O3 (Serious) >=50.
                                                                                O3 (Severe) >=25.
                                                                                O3 (Extreme) >=10.
                                                                                PM2.5 (Serious) >=70.
(4) CO...............................  >=2,500................  >=1,000................  >=1,000.
                                                                                CO (all areas) >=100.
(5) Pb...............................  .......................  >=0.5 (actual).........  >=0.5 (actual).
(6) Primary PM10.....................  >=250..................  >=100..................  >=100.
                                                                                PM10 (Serious) >=70.
(7) Primary PM2.5....................  >=250..................  >=100..................  >=100.
                                                                                PM2.5 (Serious) >=70.
(8) NH3..............................  >=250..................  >=100..................  >=100.

                                                                                PM2.5 (Serious) >=70.
----------------------------------------------------------------------------------------------------------------
\1\ Reporting thresholds for point source determination shown in tons per year of potential to emit as defined
  in 40 CFR part 70, except for Pb. Reported emissions should be in actual tons emitted for the required period.
\2\ The point source reporting thresholds vary by attainment status for SO2, VOC, NOX, CO, PM10, PM2.5, and NH3.
\3\ OTR = Ozone Transport Region, which means the area established by CAA section 184(a) or any other area
  established by the Administrator pursuant to CAA section 176A for purposes of ozone.

    This table contains the HAP reporting thresholds for non-major
sources.

     Table 1B to Appendix A of Subpart A--Reporting Thresholds by Pollutant for Hazardous Air Pollutants for
                                            Treatment as Point Source
----------------------------------------------------------------------------------------------------------------
                                                                                Actual  emissions
                                                                                initial threshold
            Description                  Associated CAPs \1\           Pollutant code \2\         (short tons/
                                                                                year)
----------------------------------------------------------------------------------------------------------------
1,1,2-Trichloroethane.............  VOC.........................  79005......................               0.22
1,1,2,2-Tetrachloroethane.........  VOC.........................  79345......................                 10
1,2,4-Trichlorobenzene............  VOC.........................  120821.....................                 10
1,2-Dibromo-3-Chloropropane.......  VOC.........................  96128......................             0.0015
1,1-Dimethyl Hydrazine............  VOC.........................  57147......................                 10
1,2-Diphenylhydrazine.............  VOC.........................  122667.....................                 10
1,2-Epoxybutane...................  VOC.........................  106887.....................                 10
1,2-Propylenimine.................  VOC.........................  75558......................                 10
1,3-Butadiene.....................  VOC.........................  106990.....................              0.078
1,3-Dichloropropene...............  VOC.........................  542756.....................                1.1
1,3-Propanesultone................  VOC.........................  1120714....................             0.0043
1,4-Dichlorobenzene...............  VOC.........................  106467.....................               0.26
1-Bromopropane....................  VOC.........................  106945.....................                 10
2,2,4-Trimethylpentane............  VOC.........................  540841.....................                 10
2,4-Dinitrophenol.................  VOC.........................  51285......................                 10
2,4,6-Trichlorophenol.............  VOC.........................  88062......................                2.2
2,4-D, salts and esters...........  VOC.........................  See Table 1D...............                 10
2,4-Dinitrotoluene................  VOC.........................  121142.....................                 10
2,4-Toluene Diisocyanate..........  VOC.........................  584849.....................              0.079
2,4,5-Trichlorophenol.............  VOC.........................  95954......................                 10
2-Chloroacetophenone..............  VOC.........................  532274.....................               0.21
2-Nitropropane....................  VOC.........................  79469......................               0.58
3,3'-Dichlorobenzidine............  VOC.........................  91941......................              0.028
3,3'-Dimethoxybenzidine...........  VOC.........................  119904.....................                 10
3,3'-Dimethylbenzidine............  VOC.........................  119937.....................                 10
4,4'-Methylenebis(2-Chloraniline).  VOC.........................  101144.....................             0.0041
4,4'-Methylenedianiline...........  VOC.........................  101779.....................             0.0027
4,4'-Methylenediphenyl              VOC.........................  101688.....................               0.59
 Diisocyanate.
4-Aminobiphenyl...................  VOC.........................  92671......................                 10
4-Dimethylaminoazobenzene.........  VOC.........................  60117......................             0.0020
4-Nitrobiphenyl...................  VOC.........................  92933......................                 10
4-Nitrophenol.....................  VOC.........................  100027.....................                 10
4,6-Dinitro-o-cresol..............  VOC.........................  534521.....................                 10
Acetaldehyde......................  VOC.........................  75070......................               0.49
Acetamide.........................  VOC.........................  60355......................               0.15
Acetonitrile......................  VOC.........................  75058......................                 10
Acetophenone......................  VOC.........................  98862......................                 10
Acrolein..........................  VOC.........................  107028.....................               0.39
Acrylamide........................  VOC.........................  79061......................              0.016
Acrylic Acid......................  VOC.........................  79107......................                1.1
Acrylonitrile.....................  VOC.........................  107131.....................              0.040
Allyl Chloride....................  VOC.........................  107051.....................               0.54
Aniline...........................  VOC.........................  62533......................                1.5
Anisidine.........................  VOC.........................  90040......................                 10
Antimony..........................  PM..........................  7440360....................                 10
Arsenic...........................  PM..........................  7440382....................            2.3E-04
Asbestos..........................  PM..........................  1332214....................                 10
Benzene...........................  VOC.........................  71432......................              0.096
Benzidine.........................  VOC.........................  92875......................            1.5E-04

Benzotrichloride..................  VOC.........................  98077......................                 10
Benzyl Chloride...................  VOC.........................  100447.....................              0.080
Beryllium.........................  PM..........................  7440417....................            4.1E-04
Biphenyl..........................  VOC.........................  92524......................                 10
Bis(2-Ethylhexyl)Phthalate........  VOC.........................  117817.....................                2.0
Bis(Chloromethyl)Ether............  VOC.........................  542881.....................            3.8E-04
Bromoform.........................  VOC.........................  75252......................                3.8
Cadmium...........................  PM..........................  7440439....................            5.6E-04
Captan............................  VOC.........................  133062.....................                 10
Carbaryl..........................  VOC.........................  63252......................                 10
Carbon Disulfide..................  VOC.........................  75150......................                 10
Carbon Tetrachloride..............  VOC.........................  56235......................               0.45
Carbonyl Sulfide..................  VOC.........................  463581.....................                 10
Catechol..........................  VOC.........................  120809.....................                 10
Chlordane.........................  VOC.........................  57749......................              0.027
Chlorine..........................  ............................  7782505....................               0.26
Chloroacetic Acid.................  VOC.........................  79118......................                 10
Chlorobenzene.....................  VOC.........................  108907.....................                 10
Chlorobenzilate...................  VOC.........................  510156.....................               0.22
Chloroform........................  VOC.........................  67663......................                 10
Chloromethyl Methyl Ether.........  VOC.........................  107302.....................                 10
Chloroprene.......................  VOC.........................  126998.....................             0.0065
Chromium Compounds:
    Chromium......................  PM..........................  7440473....................            1.2E-04
    Chromium (III)................  PM..........................  16065831...................                 10
    Chromic Acid (VI) \3\.........  PM..........................  7738945....................            1.2E-04
    Chromium Trioxide \3\.........  PM..........................  1333820....................            1.2E-04
    Chromium (VI).................  PM..........................  18540299...................            1.2E-04
Cobalt............................  PM..........................  7440484....................            2.2E-04
Coke Oven Emissions...............  VOC.........................  140........................             0.0068
Cresol/Cresylic Acid (Mixed         VOC.........................  See Table 1D...............                 10
 Isomers).
Cumene............................  VOC.........................  98828......................                 10
Cyanide Compounds.................  PM..........................  See Table 1D...............                 10
DDE (1,1-Dichloro-2,2-Bis(p-        VOC.........................  72559......................                 10
 Chlorophenyl) Ethylene).
DDE (2,2-Bis(p-                     VOC.........................  3547044....................                 10
 chlorophenyl)ethane).
Dibenzofuran......................  VOC.........................  132649.....................                 10
Dibutyl Phthalate.................  VOC.........................  84742......................                 10
Dichloroethyl Ether...............  VOC.........................  111444.....................              0.012
Dichlorvos........................  VOC.........................  62737......................                 10
Diethanolamine....................  VOC.........................  111422.....................                 10
Diethyl Sulfate...................  VOC.........................  64675......................                 10
Dimethyl formamide................  VOC.........................  68122......................                 10
Dimethyl Phthalate................  VOC.........................  131113.....................                 10
Dimethyl Sulfate..................  VOC.........................  77781......................                 10
Dimethylcarbamoyl Chloride........  VOC.........................  79447......................                 10
Dioxins and Furans................  PM..........................  See Table 1D...............            1.1E-07
Epichlorohydrin...................  VOC.........................  106898.....................                1.3
Ethyl acrylate....................  VOC.........................  140885.....................                 10
Ethyl Carbamate...................  VOC.........................  51796......................             0.0058
Ethyl Chloride....................  VOC.........................  75003......................                 10
Ethyl Benzene.....................  VOC.........................  100414.....................                 10
Ethylene Dibromide................  VOC.........................  106934.....................             0.0038
Ethylene Dichloride...............  VOC.........................  107062.....................              0.092
Ethylene Glycol...................  VOC.........................  107211.....................                 10
Ethylene Oxide....................  VOC.........................  75218......................            4.1E-04
Ethylene Thiourea.................  VOC.........................  96457......................              0.079
Ethyleneimine (Aziridine).........  VOC.........................  151564.....................                 10
Ethylidene Dichloride.............  VOC.........................  75343......................                2.6
Fine Mineral Fibers...............  PM..........................  See Table 1D...............                 10
Formaldehyde......................  VOC.........................  50000......................              0.083
Glycol Ethers.....................  VOC.........................  See Table 1D...............                 10
Heptachlor........................  VOC.........................  76448......................             0.0021
Hexachlorobenzene.................  VOC.........................  118741.....................              0.010
Hexachlorobutadiene...............  VOC.........................  87683......................               0.14
Hexachlorocyclopentadiene.........  VOC.........................  77474......................               0.31
Hexachloroethane..................  VOC.........................  67721......................                 10
Hexamethylene Diisocyanate........  VOC.........................  822060.....................              0.010
Hexamethylphosphoramide...........  VOC.........................  680319.....................                 10

Hexane............................  VOC.........................  110543.....................                 10
Hydrazine.........................  ............................  302012.....................            3.8E-04
Hydrochloric Acid.................  ............................  7647010....................                 10
Hydrogen Fluoride.................  ............................  7664393....................                7.8
Hydroquinone......................  VOC.........................  123319.....................                 10
Isophorone........................  VOC.........................  78591......................                 10
Lead..............................  PM..........................  7439921....................              0.074
Lindane (all isomers).............  VOC.........................  See Table 1D...............             0.0015
Maleic Anhydride..................  VOC.........................  108316.....................               0.64
Manganese.........................  PM..........................  7439965....................               0.16
Mercury Compounds.................  PM..........................  See Table 1D...............             0.0026
Methanol..........................  VOC.........................  67561......................                 10
Methyl Bromide....................  VOC.........................  74839......................                 10
Methyl Chloride...................  VOC.........................  74873......................                 10
Methyl Chloroform.................  ............................  71556......................                 10
Methyl Iodide.....................  VOC.........................  74884......................                 10
Methyl Isobutyl Ketone............  VOC.........................  108101.....................                 10
Methyl Isocyanate.................  VOC.........................  624839.....................                1.1
Methyl Methacrylate...............  VOC.........................  80626......................                 10
Methyl Tert-Butyl Ether...........  VOC.........................  1634044....................                5.3
Methylene Chloride................  ............................  75092......................                 10
Methylhydrazine...................  VOC.........................  60344......................                 10
Naphthalene.......................  VOC.........................  91203......................              0.027
Nickel Compounds..................  PM..........................  See Table 1D...............             0.0021
Nitrobenzene......................  VOC.........................  98953......................              0.076
N,N-Dimethylaniline...............  VOC.........................  121697.....................                 10
N-Nitrosodimethylamine............  VOC.........................  62759......................            3.5E-04
N-Nitrosomorpholine...............  VOC.........................  59892......................            6.6E-04
o-Toluidine.......................  VOC.........................  95534......................              0.058
p-Dioxane.........................  VOC.........................  123911.....................               0.40
p-Phenylenediamine................  VOC.........................  106503.....................                 10
Parathion.........................  VOC.........................  56382......................                 10
Pentachloronitrobenzene...........  VOC.........................  82688......................                 10
Pentachlorophenol.................  VOC.........................  87865......................                1.7
Phenol............................  VOC.........................  108952.....................                 10
Phosgene..........................  VOC.........................  75445......................               0.48
Phosphine.........................  ............................  7803512....................               0.16
Phosphorus........................  PM..........................  7723140....................                 10
Phthalic Anhydride................  VOC.........................  85449......................                 10
Polychlorinated Biphenyls.........  VOC.........................  See Table 1D...............               0.29
Polycyclic Organic Matter:          VOC.........................  N590.......................              0.027
 Polycyclic aromatic compounds
 (includes 25 specific compounds).
    1,6-Dinitropyrene.............  VOC.........................  42397648...................             0.0011
    1,8-Dinitropyrene.............  VOC.........................  42397659...................             0.0025
    1-Nitropyrene.................  VOC.........................  5522430....................              0.028
    3-Methylcholanthrene..........  VOC.........................  56495......................           4.70E-04
    4-Nitropyrene.................  VOC.........................  57835924...................              0.028
    5-Methylchrysene..............  VOC.........................  3697243....................             0.0025
    6-Nitrochrysene...............  VOC.........................  7496028....................             0.0011
    7,12-Dimethylbenz[a]anthracene  VOC.........................  57976......................           4.90E-05
    7H-Dibenzo[c,g]carbazole......  VOC.........................  194592.....................             0.0025
    Benz[a]anthracene.............  VOC.........................  56553......................              0.028
    Benzo[a]phenanthrene            VOC.........................  218019.....................               0.31
     (Chrysene).
    Benzo[a]pyrene................  VOC.........................  50328......................             0.0025
    Benzo[b]fluoranthene..........  VOC.........................  205992.....................              0.028
    Benzo[j,k]fluorene              VOC.........................  206440.....................              0.027
     (Fluoranthene).
    Benzo[j]fluoranthene..........  VOC.........................  205823.....................              0.028
    Benzo[k]fluoranthene..........  VOC.........................  207089.....................               0.31
    Dibenz[a,h]acridine...........  VOC.........................  226368.....................              0.028
    Dibenz[a,j]acridine...........  VOC.........................  224420.....................              0.028
    Dibenzo[a,e]fluoranthene......  VOC.........................  5385751....................              0.027
    Dibenzo[a,e]pyrene............  VOC.........................  192654.....................             0.0025
    Dibenzo[a,h]anthracene........  VOC.........................  53703......................             0.0025
    Dibenzo[a,h]pyrene............  VOC.........................  189640.....................             0.0011
    Dibenzo[a,i]pyrene............  VOC.........................  189559.....................             0.0011
    Dibenzo[a,l]pyrene............  VOC.........................  191300.....................             0.0011
    Indeno[1,2,3-c,d]pyrene.......  VOC.........................  193395.....................              0.028
Polycyclic Organic Matter, other
 than N590:

    PAH, total \4\................  VOC.........................  130498292..................              0.027
    PAH/POM--Unspecified..........  VOC.........................  250........................              0.027
    Other POM.....................  VOC.........................  See Table 1D...............                 10
    1-Methylnaphthalene...........  VOC.........................  90120......................              0.027
    1-Methylphenanthrene..........  VOC.........................  832699.....................              0.027
    1-Methylpyrene................  VOC.........................  2381217....................              0.027
    12-Methylbenz(a)Anthracene....  VOC.........................  2422799....................              0.027
    2-Chloronaphthalene...........  VOC.........................  91587......................              0.027
    2-Methylnaphthalene...........  VOC.........................  91576......................              0.027
    2-Methylphenanthrene..........  VOC.........................  2531842....................              0.027
    2-Nitrofluorene...............  VOC.........................  607578.....................               0.31
    5-Nitroacenaphthene...........  VOC.........................  602879.....................              0.027
    9-Methyl anthracene...........  VOC.........................  779022.....................              0.027
    Acenaphthene..................  VOC.........................  83329......................              0.027
    Acenaphthylene................  VOC.........................  208968.....................              0.027
    Anthracene....................  VOC.........................  120127.....................              0.027
    Benzo(a)fluoranthene..........  VOC.........................  203338.....................              0.027
    Benzo(c)phenanthrene..........  VOC.........................  195197.....................              0.027
    Benzo(g,h,i)fluoranthene......  VOC.........................  203123.....................              0.027
    Benzo[e]pyrene................  VOC.........................  192972.....................              0.027
    Benzo[g,h,i]perylene..........  VOC.........................  191242.....................              0.027
    Benzofluoranthene.............  VOC.........................  56832736...................              0.027
    BenzoIphenanthrene............  VOC.........................  195197.....................              0.027
    Carbazole.....................  VOC.........................  86748......................               0.31
    Coal Tar......................  VOC.........................  8007452....................             0.0035
    Fluorene......................  VOC.........................  86737......................              0.027
    Indeno[1,2,3-c,d]Pyrene.......  VOC.........................  193395.....................              0.028
    Methylanthracene..............  VOC.........................  26914181...................              0.027
    Methylbenzopyrene.............  VOC.........................  65357699...................              0.027
    Methylchrysene................  VOC.........................  41637905...................             0.0025
    Perylene......................  VOC.........................  198550.....................              0.027
    Phenanthrene..................  VOC.........................  85018......................              0.027
    Pyrene........................  VOC.........................  129000.....................              0.027
Propionaldehyde...................  VOC.........................  123386.....................                5.7
Propoxur..........................  VOC.........................  114261.....................                 10
Propylene Dichloride..............  VOC.........................  78875......................                 10
Propylene Oxide...................  VOC.........................  75569......................                1.3
Quinoline.........................  VOC.........................  91225......................                 10
Quinone...........................  VOC.........................  106514.....................                 10
Selenium..........................  PM..........................  7782492....................                 10
Styrene...........................  VOC.........................  100425.....................                 10
Styrene oxide.....................  VOC.........................  96093......................                 10
Tetrachloroethylene...............  ............................  127184.....................                7.7
Titanium Tetrachloride............  ............................  7550450....................               0.22
Toluene...........................  VOC.........................  108883.....................                 10
Toluene-2,4-Diamine...............  VOC.........................  95807......................              0.010
Toxaphene.........................  VOC.........................  8001352....................             0.0084
Trichloroethylene.................  VOC.........................  79016......................               0.48
Triethylamine.....................  VOC.........................  121448.....................                9.5
Trifluralin.......................  VOC.........................  1582098....................                 10
Vinyl Acetate.....................  VOC.........................  108054.....................                 10
Vinyl Bromide.....................  VOC.........................  593602.....................               0.79
Vinyl Chloride....................  VOC.........................  75014......................               0.43
Vinylidene Chloride...............  VOC.........................  75354......................                 10
Xylenes...........................  VOC.........................  See Table 1D...............                 10
----------------------------------------------------------------------------------------------------------------
\1\ For pollutants denoted with ``PM,'' incidental CAPs include at least primary PM10 and PM2.5 and filterable
  PM10 and PM2.5.
\2\ The pollutant code is usually the Chemical Abstracts Service (CAS) code but is otherwise assigned for use in
  reporting to EPA.
\3\ Report as Chromium (VI), converting mass when emissions value represents compound mass rather than chromium
  mass.
\4\ If total PAH or any combination of individual PAH exceeds the total PAH reporting threshold or any
  individual PAH compound exceeds its reporting threshold, then all individual PAHs as well as total PAH must be
  reported.

 Table 1C to Appendix A of Subpart A--Applicable Primary NAICS Codes To
          Identify Non-Major Sources for Point Source Reporting
------------------------------------------------------------------------
             NAICS \1\                           Description
------------------------------------------------------------------------
21xxxx, 22xxxx, 3xxxxx except for   Industrial and manufacturing
 311811.                             industries.
4247xx............................  Petroleum and Petroleum Products
                                     Merchant Wholesalers.
481xxx............................  Scheduled Air Transportation.
486xxx............................  Pipeline Transportation.
4883xx............................  Support Activities for Water
                                     Transportation.
493xxx............................  Warehousing and Storage.
5417xx............................  Scientific Research and Development
                                     Services.
54199x............................  Other Professional, Scientific, and
                                     Technical Services.
56191x............................  Packaging and Labeling Services.
5622xx............................  Waste Treatment and Disposal.
5629xx............................  Waste Management and Remediation
                                     Services.
61131x............................  Colleges, Universities, and
                                     Professional Schools.
62211x............................  General Medical and Surgical
                                     Hospitals.
62231x............................  Specialty (except Psychiatric and
                                     Substance Abuse) Hospitals.
811121............................  Automotive Body, Paint and Interior
                                     Repair and Maintenance.\2\
8122xx............................  Death Care Services.
812332............................  Industrial Launderers.
92214x............................  Correctional Institutions.
927xxx............................  Space Research and Technology.
928xxx............................  National Security and International
                                     Affairs.
------------------------------------------------------------------------
\1\ Based on 2017 NAICS codes. The ``x'' values represent all NAICS
  codes starting with the digits preceding the ``x'' values.
\2\ Excluding small entities for primary NAICS 811121.

                 Table 1D--to Appendix A of Subpart A--Pollutants To Report for Compound Groups
----------------------------------------------------------------------------------------------------------------
              Pollutant group                     Component pollutant name       Associated CAPs  Pollutant code
----------------------------------------------------------------------------------------------------------------
2,4-D, salts and esters....................  2,4-Dichlorophenoxy Acetic Acid...              VOC           94757
                                             2,4-D sodium salt.................              VOC         2702729
                                             2,4-D diethanolamine salt.........              VOC         5742198
                                             2,4-D dimethylamine salt..........              VOC         2008391
                                             2,4-D isopropylamine salt.........              VOC         5742176
                                             2,4-D triisopropanolammonium salt.              VOC        32341803
                                             2,4-D butoxyethyl ester...........              VOC         1929733
                                             2,4-D 2-ethylhexyl ester..........              VOC         1928434
                                             2,4-D isopropyl ester.............              VOC           94111
                                             2,4-D butyl ester.................              VOC           94804
                                             2,4-D propylene glycol butyl ether              VOC         1320189
                                              ester (2,4-D 2-butoxymethyl-ethyl
                                              ester).
                                             2,4-D chlorocrotyl ester..........              VOC         2971382
                                             2,4-D 2-ethyl-4-methylpentyl ester              VOC        53404378
Cresol/Cresylic Acid (Mixed Isomers).......  Cresol/Cresylic Acid (Mixed                     VOC         1319773
                                              Isomers).                                      VOC          108394
                                             m-Cresol..........................
                                             o-Cresol..........................              VOC           95487
                                             p-Cresol..........................              VOC          106445
Cyanide Compounds..........................  Calcium Cyanamide.................              PM            57125
                                             Cyanide...........................              PM           156627
                                             Hydrogen Cyanide..................              PM            74908
Dioxins and Furans.........................  1,2,3,4,6,7,8,9-Octachlorodibenzo-              PM          3268879
                                              p-dioxin.
                                             1,2,3,4,6,7,8,9-                                PM         39001020
                                              Octachlorodibenzofuran.
                                             1,2,3,4,6,7,8-Heptachlorodibenzo-p-             PM         35822469
                                              dioxin.
                                             1,2,3,4,6,7,8-                                  PM         67562394
                                              Heptachlorodibenzofuran.
                                             1,2,3,4,7,8,9-                                  PM         55673897
                                              Heptachlorodibenzofuran.
                                             1,2,3,4,7,8-Hexachlorodibenzo-p-                PM         39227286
                                              dioxin.
                                             1,2,3,4,7,8-Hexachlorodibenzofuran              PM         70648269
                                             1,2,3,6,7,8-Hexachlorodibenzo-p-                PM         57653857
                                              dioxin.
                                             1,2,3,6,7,8-Hexachlorodibenzofuran              PM         57117449
                                             1,2,3,7,8,9-Hexachlorodibenzo-p-                PM         19408743
                                              dioxin.
                                             1,2,3,7,8,9-Hexachlorodibenzofuran              PM         72918219
                                             1,2,3,7,8-Pentachlorodibenzo-p-                 PM         40321764
                                              dioxin.
                                             1,2,3,7,8-Pentachlorodibenzofuran.              PM         57117416
                                             2,3,4,6,7,8-Hexachlorodibenzofuran              PM         60851345
                                             2,3,4,7,8-Pentachlorodibenzofuran.              PM         57117314
                                             2,3,7,8-Tetrachlorodibenzo-p-                   PM          1746016
                                              dioxin.
                                             2,3,7,8-Tetrachlorodibenzofuran...              PM         51207319
Fine Mineral Fibers........................  Fine Mineral Fibers...............              PM              383
                                             Ceramic Fibers (man-made fibers)..              PM              608
                                             Glasswool (man-made fibers).......              PM              613

                                             Slagwool (man-made fibers)........              PM              616
                                             Rockwool (man-made fibers)........              PM              617
Glycol Ethers..............................  1,2-Dimethoxyethane...............              VOC          110714
                                             2-(Hexyloxy)Ethanol...............              VOC          112254
                                             2-Butoxyethyl Acetate.............              VOC          112072
                                             2-Propoxyethyl Acetate............              VOC        20706256
                                             Butyl Carbitol Acetate............              VOC          124174
                                             Carbitol Acetate..................              VOC          112152
                                             Cellosolve Acetate................              VOC          111159
                                             Cellosolve Solvent................              VOC          110805
                                             Diethylene Glycol Diethyl Ether...              VOC          112367
                                             Diethylene Glycol Dimethyl Ether..              VOC          111966
                                             Diethylene Glycol Ethyl Methyl                  VOC         1002671
                                              Ether.
                                             Diethylene Glycol-Mono-2-Methyl-                VOC        10143563
                                              Pentyl Ether.
                                             Diethylene Glycol Monobutyl Ether.              VOC          112345
                                             Diethylene Glycol Monoethyl Ether.              VOC          111900
                                             Diethylene Glycol Monoisobutyl                  VOC        18912806
                                              Ether.
                                             Diethylene Glycol Monomethyl Ether              VOC          111773
                                             Ethoxytriglycol...................              VOC          112505
                                             Ethylene Glycol Diethyl Ether.....              VOC          629141
                                             Ethylene Glycol Methyl Ether......              VOC          109864
                                             Ethylene Glycol Mono-2-                         VOC        10137969
                                              Methylpentyl Ether.
                                             Ethylene Glycol Mono-Sec-Butyl                  VOC         7795917
                                              Ether.
                                             Ethylene Glycol Monomethyl Ether                VOC          110496
                                              Acetate.
                                             Ethylene Glycol Monophenyl Ether                VOC        23495127
                                              Propionate.
                                             Glycol Ethers.....................              VOC             171
                                             Isobutyl Cellosolve...............              VOC         4439241
                                             Methoxytriglycol..................              VOC          112356
                                             Methyl Cellosolve Acrylate........              VOC         3121617
                                             N-Hexyl Carbitol..................              VOC          112594
                                             Phenyl Cellosolve.................              VOC          122996
                                             Propyl Cellosolve.................              VOC         2807309
                                             Triethylene Glycol Dimethyl Ether.              VOC          112492
                                             Triglycol Monobutyl Ether.........              VOC          143226
                                             1,2,3,4,5,6-Hexachlorocyclohexane               VOC          608731
                                              (technical) (Mixed Isomers).
                                             .alpha.-Hexachlorocyclohexane.....              VOC          319846
                                             .beta.-Hexachlorocyclohexane......              VOC          319857
                                             .delta.-Hexachlorocyclohexane.....              VOC          319868
                                             .gamma.-Hexachlorocyclohexane                   VOC           58899
                                              (Lindane).
                                             .epsilon.-Hexachlorocyclohexane...              VOC         6108107
                                             .zeta.-Hexachlorocyclohexane......              VOC         6108118
                                             .eta.-Hexachlorocyclohexane.......              VOC         6108129
                                             .theta.-Hexachlorocyclohexane.....              VOC         6108130
                                             1,2,3,4,5,6-Hexachlorocyclohexane               VOC          608731
                                              (technical) (Mixed Isomers).
Mercury Compounds..........................  Mercury...........................  ...............         7439976
                                             Elemental gaseous mercury.........  ...............             200
                                             Gaseous divalent mercury..........  ...............             201
                                             Particulate divalent mercury......              PM              202
Nickel Compounds...........................  Nickel............................              PM          7440020
                                             Nickel Oxide......................              PM          1313991
                                             Nickel Refinery Dust..............              PM              604
                                             Nickel Subsulfide.................              PM         12035722
Other POM..................................  1-Amino-2,4-dibromoanthraquinone..              VOC           81492
                                             1-Amino-2-methylanthraquinone.....              VOC           82280
                                             2-Aminoanthraquinone..............              VOC          117793
                                             2-Phenylphenol....................              VOC           90437
                                             3,3'-Dichlorobenzidine                          VOC          612839
                                              dihydrochloride.
                                             3,3'-Dichlorobenzidine sulfate....              VOC        64969342
                                             3,3'-Dimethoxybenzidine                         VOC        20325400
                                              dihydrochloride.
                                             3,3'-Dimethoxybenzidine                         VOC       111984099
                                              monohydrochloride.
                                             3,3'-Dimethylbenzidine                          VOC          612828
                                              dihydrochloride.
                                             3,3'-Dimethylbenzidine                          VOC        41766750
                                              dihydrofluoride.
                                             4,4'-Diaminodiphenyl ether........              VOC          101804
                                             4,4'-Isopropylidenediphenol.......              VOC           80057
                                             4,4'-Methylenebis(N,N-                          VOC          101611
                                              dimethyl)benzenamine (4,4'-
                                              Methylenebis[N,N-
                                              dimethylaniline]).
                                             4,4'-Thiodianiline................              VOC          139651
                                             4-Aminoazobenzene.................              VOC           60093
                                             Acifluorfen, sodium salt..........              VOC        62476599
                                             alpha-Naphthylamine (1-                         VOC          134327
                                              Naphthalenamine).
                                             Amitraz...........................              VOC        33089611

                                             Benzoyl peroxide..................              VOC           94360
                                             beta-Naphthylamine (2-                          VOC           91598
                                              Naphthalenamine).
                                             Bifenthrin........................              VOC        82657043
                                             C.I. Acid Green 3.................              VOC         4680788
                                             C.I. Acid Red 114.................              VOC         6459945
                                             C.I. Basic Green 4 (Malachite                   VOC          569642
                                              green).
                                             C.I. Basic Red 1..................              VOC          989388
                                             C.I. Direct Black 38..............              VOC         1937377
                                             C.I. Direct Blue 218..............              VOC        28407376
                                             C.I. Direct Blue 6................              VOC         2602462
                                             C.I. Direct Brown 95..............              VOC        16071866
                                             C.I. Disperse Yellow 3............              VOC         2832408
                                             C.I. Food Red 15 (Rhodamine B)....              VOC           81889
                                             C.I. Food Red 5...................              VOC         3761533
                                             C.I. Solvent Orange 7.............              VOC         3118976
                                             C.I. Solvent Yellow 14............              VOC          842079
                                             C.I. Solvent Yellow 3.............              VOC           97563
                                             C.I. Solvent Yellow 34 (Auramine).              VOC          492808
                                             C.I. Vat Yellow 4.................              VOC          128665
                                             Cyfluthrin........................              VOC        68359375
                                             Cyhalothrin.......................              VOC        68085858
                                             Decabromodiphenyl oxide...........              VOC         1163195
                                             Desmedipham.......................              VOC        13684565
                                             Dichlorophene.....................              VOC           97234
                                             Diclofop methyl...................              VOC        51338273
                                             Dicofol...........................              VOC          115322
                                             Diflubenzuron.....................              VOC        35367385
                                             Diphenamid........................              VOC          957517
                                             Diphenylamine.....................              VOC          122394
                                             Fenarimol.........................              VOC        60168889
                                             Fenbutatin oxide..................              VOC        13356086
                                             Fenoxaprop-ethyl..................              VOC        66441234
                                             Fenoxycarb........................              VOC        72490018
                                             Fenpropathrin.....................              VOC        39515418
                                             Fenvalerate.......................              VOC        51630581
                                             Fluvalinate.......................              VOC        69409945
                                             Fomesafen.........................              VOC        72178020
                                             Hexachloronaphthalene.............              VOC         1335871
                                             Hexachlorophene...................              VOC           70304
                                             Hydramethylnon....................              VOC        67485294
                                             Lactofen..........................              VOC        77501634
                                             Michler's ketone..................              VOC           90948
                                             Nitrofen..........................              VOC         1836755
                                             N-Nitrosodiphenylamine............              VOC           86306
                                             Octachloronaphthalene.............              VOC         2234131
                                             Oxyfluorfen.......................              VOC        42874033
                                             Permethrin........................              VOC        52645531
                                             Phenolphthalein (3,3-Bis(4-                     VOC           77098
                                              hydroxyphenyl) phthalide).
                                             Phenothrin........................              VOC        26002802
                                             Phenytoin.........................              VOC           57410
                                             p-Nitrosodiphenylamine............              VOC          156105
                                             Polybrominated biphenyls (PBBs)...              VOC            N575
                                             Quizalofop-ethyl..................              VOC        76578148
                                             Sodium o-phenylphenoxide..........              VOC          132274
                                             Temephos..........................              VOC         3383968
                                             Tetrabromobisphenol A.............              VOC           79947
                                             Triphenyltin chloride.............              VOC          639587
                                             Triphenyltin hydroxide............              VOC           76879
                                             Trypan blue.......................              VOC           72571
                                             Warfarin and salts................              VOC            N874