10.0
                                      10
Isle Royale National Park
                                                                            699
                                                                           47.9
                                                                           89.2
                                      14
                                      993
                                     11.4
                                      3.5
                                     11.8
                                      12
Isle Royale National Park (New)
                                                                            610
                                                                           47.5
                                                                           88.1
                                     13.8
                                      989
                                     11.4
                                      3.7
                                     11.9
                                      12
James River Face
                                                                            981
                                                                           37.6
                                                                           79.5
                                     13.3
                                      979
                                     11.3
                                     13.0
                                     11.3
                                      11
Jarbidge Wilderness
                                                                           6173
                                                                           41.9
                                                                          115.4
                                       3
                                      803
                                      9.6
                                      7.1
                                      9.5
                                       9
Jefferson/James River Face Wilderness
                                                                            918
                                                                           37.7
                                                                           79.4
                                     13.4
                                      981
                                     11.3
                                     13.1
                                     11.3
                                      11
Joshua Tree
                                                                           4028
                                                                           34.1
                                                                          116.4
                                      7.2
                                      872
                                     10.3
                                     14.9
                                     10.0
                                      10
Joshua Tree National Monument
                                                                           4028
                                                                           34.1
                                                                          116.4
                                      7.2
                                      872
                                     10.3
                                     14.9
                                     10.0
                                      10
Kaiser
                                                                           8439
                                                                           37.2
                                                                          119.2
                                     -1.5
                                      737
                                      9.0
                                      3.4
                                      8.8
                                       9
Kalmiopsis
                                                                            295
                                                                           42.6
                                                                          124.1
                                     14.6
                                     1005
                                     11.5
                                     13.1
                                     11.6
                                      12
Lassen Volcanic National Park
                                                                           5756
                                                                           40.5
                                                                          121.6
                                      3.8
                                      816
                                      9.8
                                      5.3
                                      9.7
                                      10
Lava Beds
                                                                           4818
                                                                           41.7
                                                                          121.5
                                      5.7
                                      846
                                     10.0
                                      8.7
                                      9.9
                                      10
Linville Gorge
                                                                           3234
                                                                             36
                                                                           81.9
                                      8.8
                                      898
                                     10.5
                                     10.0
                                     10.5
                                      11
Livonia
                                                                            977
                                                                           38.5
                                                                           86.3
                                     13.3
                                      979
                                     11.3
                                     12.2
                                     11.4
                                      11
Lone Peak Wilderness
                                                                           5799
                                                                           40.4
                                                                          111.7
                                      3.7
                                      815
                                      9.7
                                      9.1
                                      9.6
                                      10
Lostwood
                                                                           2270
                                                                           48.6
                                                                          102.4
                                     10.7
                                      932
                                     10.9
                                      3.2
                                     11.2
                                      11
Lye Brook Wilderness
                                                                           3300
                                                                           43.1
                                                                           73.1
                                      8.7
                                      896
                                     10.5
                                      2.4
                                     10.8
                                      11
Lynden
                                                                             92
                                                                             49
                                                                          122.6
                                      15
                                     1013
                                     11.6
                                     10.1
                                     11.8
                                      12
M.K. Goddard
                                                                           1269
                                                                           41.4
                                                                           80.1
                                     12.7
                                      968
                                     11.2
                                      9.0
                                     11.4
                                      11
Mammoth Cave National Park
                                                                            813
                                                                           37.1
                                                                           86.1
                                     13.6
                                      985
                                     11.4
                                     13.7
                                     11.4
                                      11
Mauna Loa National Observatory (MALO1)
                                                                          11152
                                                                           19.5
                                                                          155.6
                                     -6.9
                                      665
                                      8.3
                                      7.0
                                      7.9
                                       8
Meadview
                                                                           2959
                                                                             36
                                                                          114.1
                                      9.3
                                      908
                                     10.6
                                     16.2
                                     10.4
                                      10
Medicine Lake
                                                                           1984
                                                                           48.5
                                                                          104.5
                                     11.3
                                      942
                                     11.0
                                      4.8
                                     11.2
                                      11
Mesa Verde National Park
                                                                           7141
                                                                           37.2
                                                                          108.5
                                       1
                                      774
                                      9.4
                                      8.7
                                      9.1
                                       9
Mingo
                                                                            367
                                                                             37
                                                                           90.1
                                     14.5
                                     1002
                                     11.5
                                     14.3
                                     11.5
                                      12
Mohawk Mt.
                                                                           1745
                                                                           41.8
                                                                           73.3
                                     11.7
                                      951
                                     11.0
                                      6.3
                                     11.3
                                      11
Monture
                                                                           4241
                                                                           47.1
                                                                          113.2
                                      6.8
                                      865
                                     10.2
                                      3.5
                                     10.3
                                      10
Moosehorn NWR
                                                                            308
                                                                           45.1
                                                                           67.3
                                     14.6
                                     1004
                                     11.5
                                      6.0
                                     11.9
                                      12
Mount Baldy
                                                                           8243
                                                                           34.1
                                                                          109.4
                                     -1.1
                                      743
                                      9.0
                                      7.6
                                      8.8
                                       9
Mount Hood
                                                                           4398
                                                                           45.3
                                                                          121.8
                                      6.5
                                      860
                                     10.2
                                      4.3
                                     10.3
                                      10
Mount Rainier National Park
                                                                           1401
                                                                           46.8
                                                                          122.1
                                     12.4
                                      963
                                     11.2
                                      8.9
                                     11.3
                                      11
Mount Zirkel Wilderness
                                                                          10637
                                                                           40.5
                                                                          106.7
                                     -5.9
                                      678
                                      8.4
                                      0.2
                                      8.2
                                       8
Mount Zirkel Wilderness (Storm Peak)
                                                                          10562
                                                                           40.5
                                                                          106.7
                                     -5.7
                                      680
                                      8.4
                                      0.5
                                      8.2
                                       8
North Absaroka
                                                                           8134
                                                                           44.7
                                                                          109.4
                                     -0.9
                                      746
                                      9.1
                                     -0.9
                                      9.1
                                       9
North Cascades
                                                                           1889
                                                                           48.7
                                                                          121.1
                                     11.5
                                      946
                                     11.0
                                      7.2
                                     11.2
                                      11
Okefenokee National Wildlife Refuge
                                                                            161
                                                                           30.7
                                                                           82.1
                                     14.9
                                     1010
                                     11.6
                                     20.3
                                     11.4
                                      11
Old Town
                                                                            213
                                                                           44.9
                                                                           68.6
                                     14.8
                                     1008
                                     11.6
                                      6.2
                                     11.9
                                      12
Olympic
                                                                           1968
                                                                             48
                                                                            123
                                     11.3
                                      943
                                     11.0
                                     10.9
                                     11.0
                                      11
Organ Pipe
                                                                           1847
                                                                             32
                                                                            113
                                     11.5
                                      947
                                     11.0
                                     21.0
                                     10.7
                                      11
Pasayten
                                                                           5360
                                                                           48.4
                                                                          119.9
                                      4.6
                                      829
                                      9.9
                                      4.8
                                      9.9
                                      10
Petrified Forest National Park
                                                                           5796
                                                                           35.1
                                                                          109.8
                                      3.7
                                      815
                                      9.7
                                     11.7
                                      9.5
                                       9
Phoenix
                                                                           1109
                                                                           33.5
                                                                          112.1
                                      13
                                      974
                                     11.3
                                     23.4
                                     10.9
                                      11
Pinnacles National Monument
                                                                           1040
                                                                           36.5
                                                                          121.2
                                     13.1
                                      980
                                     11.3
                                     16.0
                                     11.2
                                      11
Point Reyes National Seashore
                                                                            279
                                                                           38.1
                                                                          122.9
                                     14.6
                                     1005
                                     11.6
                                     11.3
                                     11.7
                                      12
Presque Isle
                                                                            535
                                                                           46.7
                                                                             68
                                     14.1
                                      996
                                     11.5
                                      4.8
                                     11.8
                                      12
Proctor Maple R. F.
                                                                           1322
                                                                           44.5
                                                                           72.9
                                     12.6
                                      966
                                     11.2
                                      4.5
                                     11.5
                                      12
Puget Sound
                                                                            262
                                                                           47.6
                                                                          122.3
                                     14.7
                                     1006
                                     11.6
                                     10.7
                                     11.7
                                      12
Quabbin Summit
                                                                           1033
                                                                           42.3
                                                                           72.3
                                     13.2
                                      977
                                     11.3
                                      6.7
                                     11.6
                                      12
Quaker City
                                                                           1233
                                                                           39.9
                                                                           81.3
                                     12.8
                                      970
                                     11.2
                                      9.8
                                     11.3
                                      11
Queen Valley
                                                                           2158
                                                                           33.3
                                                                          111.3
                                     10.9
                                      936
                                     10.9
                                     21.8
                                     10.5
                                      11
Redwood National Park
                                                                            804
                                                                           41.6
                                                                          124.1
                                     13.6
                                      985
                                     11.4
                                      8.7
                                     11.6
                                      12
Rocky Mountain National Park
                                                                           9036
                                                                           40.3
                                                                          105.5
                                     -2.7
                                      721
                                      8.8
                                      1.9
                                      8.7
                                       9
Rocky Mountain National Park (Headquarters)
                                                                           7872
                                                                           40.4
                                                                          105.6
                                     -0.4
                                      753
                                      9.1
                                      5.5
                                      8.9
                                       9
Saguaro National Monument
                                                                           3060
                                                                           32.2
                                                                          110.7
                                      9.1
                                      904
                                     10.6
                                     18.1
                                     10.3
                                      10
Saguaro West
                                                                           2355
                                                                           32.2
                                                                          111.2
                                     10.5
                                      929
                                     10.8
                                     21.5
                                     10.4
                                      10
Salmon National Forest
                                                                           9145
                                                                           45.2
                                                                            114
                                     -2.9
                                      718
                                      8.8
                                     -7.6
                                      8.9
                                       9
Salt Creek
                                                                           3533
                                                                           33.5
                                                                          104.4
                                      8.2
                                      888
                                     10.5
                                     15.3
                                     10.2
                                      10
San Andres
                                                                           4674
                                                                           32.7
                                                                          106.5
                                      5.9
                                      851
                                     10.1
                                     13.3
                                      9.8
                                      10
San Gabriel
                                                                           5874
                                                                           34.3
                                                                            118
                                      3.6
                                      813
                                      9.7
                                     13.1
                                      9.4
                                       9
San Gorgonio Wilderness
                                                                           5592
                                                                           34.2
                                                                          116.9
                                      4.1
                                      821
                                      9.8
                                     12.0
                                      9.5
                                      10
San Pedro Parks
                                                                           9574
                                                                             36
                                                                          106.8
                                     -3.8
                                      706
                                      8.7
                                     -0.3
                                      8.6
                                       9
San Rafael
                                                                           3126
                                                                           34.7
                                                                            120
                                       9
                                      902
                                     10.6
                                     16.7
                                     10.3
                                      10
Sawtooth National Forest
                                                                           6494
                                                                           44.2
                                                                          114.9
                                      2.3
                                      794
                                      9.5
                                      1.1
                                      9.6
                                      10
Scoville
                                                                           4920
                                                                           43.7
                                                                            113
                                      5.4
                                      843
                                     10.0
                                      6.1
                                     10.0
                                      10
Seney
                                                                            708
                                                                           46.3
                                                                           85.9
                                     13.8
                                      989
                                     11.4
                                      5.8
                                     11.7
                                      12
Sequoia National Park
                                                                           1755
                                                                           36.5
                                                                          118.8
                                     11.7
                                      950
                                     11.0
                                     17.0
                                     10.8
                                      11
Shenandoah National Park
                                                                           3601
                                                                           38.5
                                                                           78.4
                                      8.1
                                      886
                                     10.4
                                      8.2
                                     10.4
                                      10
Shining Rock Wilderness
                                                                           5317
                                                                           35.4
                                                                           82.8
                                      4.7
                                      830
                                      9.9
                                      7.4
                                      9.8
                                      10
Sierra Ancha
                                                                           5232
                                                                           34.1
                                                                          110.9
                                      4.8
                                      833
                                      9.9
                                     12.5
                                      9.7
                                      10
Sikes
                                                                            148
                                                                           32.1
                                                                           92.4
                                     14.9
                                     1010
                                     11.6
                                     18.2
                                     11.5
                                      11
Simeonof
                                                                             98
                                                                           55.3
                                                                          160.5
                                      15
                                     1012
                                     11.6
                                      4.5
                                     12.1
                                      12
Sipsy Wilderness
                                                                            915
                                                                           34.3
                                                                           87.3
                                     13.4
                                      981
                                     11.3
                                     15.5
                                     11.2
                                      11
Snoqualamie Pass, Snoqualamie N.F
                                                                           3805
                                                                           47.4
                                                                          121.4
                                      7.7
                                      879
                                     10.4
                                      3.2
                                     10.5
                                      11
South Lake Tahoe
                                                                           6232
                                                                           38.9
                                                                            120
                                      2.8
                                      802
                                      9.6
                                      6.1
                                      9.5
                                      10
Spokane Res.
                                                                           1797
                                                                           47.9
                                                                          117.9
                                     11.6
                                      949
                                     11.0
                                     10.0
                                     11.1
                                      11
St. Marks
                                                                              7
                                                                           30.1
                                                                           84.2
                                     15.2
                                     1016
                                     11.7
                                     19.8
                                     11.5
                                      11
Starkey
                                                                           4126
                                                                           45.2
                                                                          118.5
                                       7
                                      869
                                     10.3
                                      4.2
                                     10.4
                                      10
Sula (Selway Bitteroot Wilderness)
                                                                           6242
                                                                           45.9
                                                                            114
                                      2.8
                                      801
                                      9.6
                                     -0.5
                                      9.7
                                      10
Swanquarter
                                                                              7
                                                                           35.5
                                                                           76.2
                                     15.2
                                     1016
                                     11.7
                                     16.9
                                     11.6
                                      12
Sycamore Canyon
                                                                           6691
                                                                           35.1
                                                                            112
                                      1.9
                                      788
                                      9.5
                                      9.8
                                      9.2
                                       9
Theodore Roosevelt
                                                                           2798
                                                                           46.9
                                                                          103.4
                                      9.7
                                      914
                                     10.7
                                      5.1
                                     10.9
                                      11
Three Sisters Wilderness
                                                                           2903
                                                                           44.3
                                                                            122
                                      9.4
                                      910
                                     10.7
                                      6.8
                                     10.8
                                      11
Tonto National Monument
                                                                           2578
                                                                           33.6
                                                                          111.1
                                     10.1
                                      921
                                     10.8
                                     18.7
                                     10.4
                                      10
Trapper Creek
                                                                            479
                                                                           62.3
                                                                          150.3
                                     14.3
                                      998
                                     11.5
                                      2.3
                                     12.0
                                      12
Trinity
                                                                           3303
                                                                           40.8
                                                                          122.8
                                      8.7
                                      896
                                     10.5
                                     12.9
                                     10.4
                                      10
Tuxedni
                                                                             33
                                                                             60
                                                                          152.6
                                     15.1
                                     1015
                                     11.6
                                      1.8
                                     12.2
                                      12
UL Bend
                                                                           2929
                                                                           47.6
                                                                          108.7
                                      9.4
                                      909
                                     10.6
                                      5.2
                                     10.8
                                      11
Upper Buffalo Wilderness
                                                                           2371
                                                                           35.8
                                                                           93.2
                                     10.5
                                      928
                                     10.8
                                     12.5
                                     10.8
                                      11
Virgin Islands National Park
                                                                            210
                                                                           18.3
                                                                           64.8
                                     14.8
                                     1008
                                     11.6
                                     26.1
                                     11.1
                                      11
Voyageurs National Park 1
                                                                           1138
                                                                           48.6
                                                                           93.2
                                     12.9
                                      973
                                     11.3
                                      3.1
                                     11.7
                                      12
Voyageurs National Park 2
                                                                           1407
                                                                           48.4
                                                                           92.8
                                     12.4
                                      963
                                     11.2
                                      2.6
                                     11.6
                                      12
Washington D.C.
                                                                             52
                                                                           38.9
                                                                             77
                                     15.1
                                     1014
                                     11.6
                                     14.5
                                     11.7
                                      12
Weminuche Wilderness
                                                                           9069
                                                                           37.7
                                                                          107.8
                                     -2.8
                                      720
                                      8.8
                                      1.5
                                      8.7
                                       9
Wheeler Peak
                                                                          11060
                                                                           36.6
                                                                          105.5
                                     -6.7
                                      667
                                      8.3
                                     -3.0
                                      8.2
                                       8
White Mountain
                                                                           6724
                                                                           33.5
                                                                          105.5
                                      1.9
                                      787
                                      9.5
                                      9.9
                                      9.2
                                       9
White Pass
                                                                           6002
                                                                           46.6
                                                                          121.4
                                      3.3
                                      809
                                      9.7
                                      1.4
                                      9.8
                                      10
White River National Forest
                                                                          11211
                                                                           39.2
                                                                          106.8
                                      -7
                                      663
                                      8.2
                                     -0.3
                                      8.0
                                       8
Wichita Mountains
                                                                           1699
                                                                           34.7
                                                                           98.7
                                     11.8
                                      952
                                     11.1
                                     15.7
                                     10.9
                                      11
Wind Cave
                                                                           4264
                                                                           43.6
                                                                          103.5
                                      6.7
                                      864
                                     10.2
                                      8.1
                                     10.2
                                      10
Yellowstone National Park 1
                                                                           7744
                                                                           44.6
                                                                          110.4
                                     -0.1
                                      757
                                      9.2
                                     -0.2
                                      9.2
                                       9
Yellowstone National Park 2
                                                                           7954
                                                                           44.6
                                                                          110.4
                                     -0.6
                                      751
                                      9.1
                                     -0.8
                                      9.1
                                       9
Yosemite National Park
                                                                           5297
                                                                           37.7
                                                                          119.7
                                      4.7
                                      831
                                      9.9
                                      8.0
                                      9.8
                                      10
Zion
                                                                           5068
                                                                           37.5
                                                                          113.2
                                      5.2
                                      838
                                     10.0
                                     13.2
                                      9.7
                                      10

Table A3.  Mean light scattering and percent PM2.5 composition for the five major components for 20% best days as determined by measurement, the current IMPROVE algorithm and the proposed new algorithm.

Site

Mean Bsp (Mm-1)
Percent Ammonium Sulfate
Percent Ammonium Nitrate
percent OCM
Percent Soil
Percent Coarse
Percent EC
ACAD1
Measured
                                                                            6.3
                                                                             20
                                                                              3
                                                                             21
                                                                              4
                                                                             50
                                                                              3

IMPROVE
                                                                            8.6
                                                                             20
                                                                              3
                                                                             21
                                                                              4
                                                                             49
                                                                              3

NEW
                                                                            7.7
                                                                             20
                                                                              3
                                                                             22
                                                                              4
                                                                             49
                                                                              3
BIBE1
Measured
                                                                            6.3
                                                                             17
                                                                              2
                                                                             11
                                                                             10
                                                                             59
                                                                              2

IMPROVE
                                                                            8.7
                                                                             19
                                                                              2
                                                                             11
                                                                              9
                                                                             57
                                                                              2

NEW
                                                                            7.9
                                                                             18
                                                                              2
                                                                             11
                                                                              9
                                                                             57
                                                                              2
BOWA1
Measured
                                                                            5.4
                                                                             26
                                                                              3
                                                                             21
                                                                              5
                                                                             43
                                                                              2

IMPROVE
                                                                            7.7
                                                                             24
                                                                              2
                                                                             23
                                                                              5
                                                                             44
                                                                              2

NEW
                                                                            6.6
                                                                             26
                                                                              3
                                                                             20
                                                                              5
                                                                             44
                                                                              2
CORI1
Measured
                                                                            5.7
                                                                             10
                                                                              3
                                                                             17
                                                                              5
                                                                             61
                                                                              3

IMPROVE
                                                                            8.8
                                                                              9
                                                                              4
                                                                             18
                                                                              4
                                                                             62
                                                                              3

NEW
                                                                            8.4
                                                                             10
                                                                              4
                                                                             18
                                                                              5
                                                                             60
                                                                              4
DOSO1
Measured
                                                                             15
                                                                             26
                                                                              5
                                                                             20
                                                                              4
                                                                             42
                                                                              3

IMPROVE
                                                                             20
                                                                             24
                                                                              6
                                                                             20
                                                                              4
                                                                             42
                                                                              3

NEW
                                                                             19
                                                                             25
                                                                              6
                                                                             19
                                                                              4
                                                                             42
                                                                              3
GICL1
Measured
                                                                            2.9
                                                                             16
                                                                              2
                                                                             19
                                                                              8
                                                                             52
                                                                              3

IMPROVE
                                                                            4.9
                                                                             16
                                                                              2
                                                                             20
                                                                              8
                                                                             50
                                                                              3

NEW
                                                                            4.1
                                                                             17
                                                                              2
                                                                             20
                                                                              8
                                                                             48
                                                                              3
GRCA2
Measured
                                                                            2.0
                                                                             14
                                                                              3
                                                                             15
                                                                              9
                                                                             55
                                                                              2

IMPROVE
                                                                            2.8
                                                                             18
                                                                              4
                                                                             16
                                                                             11
                                                                             48
                                                                              3

NEW
                                                                            2.5
                                                                             18
                                                                              5
                                                                             15
                                                                             10
                                                                             48
                                                                              3
GRGU1
Measured
                                                                            5.4
                                                                             26
                                                                              3
                                                                             23
                                                                              2
                                                                             43
                                                                              2

IMPROVE
                                                                            8.0
                                                                             25
                                                                              4
                                                                             21
                                                                              3
                                                                             44
                                                                              3

NEW
                                                                            6.8
                                                                             25
                                                                              4
                                                                             22
                                                                              3
                                                                             44
                                                                              3
GRSM1
Measured
                                                                             15
                                                                             24
                                                                              6
                                                                             23
                                                                              4
                                                                             39
                                                                              4

IMPROVE
                                                                             20
                                                                             24
                                                                              6
                                                                             24
                                                                              4
                                                                             38
                                                                              4

NEW
                                                                             20
                                                                             25
                                                                              7
                                                                             23
                                                                              3
                                                                             38
                                                                              4
JARB1
Measured
                                                                            1.8
                                                                             11
                                                                              2
                                                                             21
                                                                              8
                                                                             56
                                                                              2

IMPROVE
                                                                            3.6
                                                                             12
                                                                              3
                                                                             22
                                                                              7
                                                                             54
                                                                              2

NEW
                                                                            3.2
                                                                             12
                                                                              3
                                                                             22
                                                                              7
                                                                             54
                                                                              2
LOPE1
Measured
                                                                            5.3
                                                                             12
                                                                              6
                                                                             19
                                                                              9
                                                                             50
                                                                              4

IMPROVE
                                                                            8.2
                                                                             12
                                                                              6
                                                                             18
                                                                             10
                                                                             50
                                                                              4

NEW
                                                                            7.2
                                                                             13
                                                                              7
                                                                             18
                                                                             10
                                                                             49
                                                                              4
LYBR1
Measured
                                                                            5.3
                                                                             24
                                                                              6
                                                                             25
                                                                              4
                                                                             38
                                                                              3

IMPROVE
                                                                            8.2
                                                                             24
                                                                              4
                                                                             27
                                                                              4
                                                                             38
                                                                              3

NEW
                                                                            7.0
                                                                             25
                                                                              5
                                                                             26
                                                                              4
                                                                             38
                                                                              3
MACA1
Measured
                                                                             18
                                                                             27
                                                                              7
                                                                             21
                                                                              4
                                                                             37
                                                                              3

IMPROVE
                                                                             22
                                                                             25
                                                                              9
                                                                             21
                                                                              4
                                                                             36
                                                                              4

NEW
                                                                             19
                                                                             26
                                                                              9
                                                                             20
                                                                              4
                                                                             37
                                                                              4
MORA1
Measured
                                                                            5.5
                                                                             14
                                                                              3
                                                                             31
                                                                              4
                                                                             45
                                                                              4

IMPROVE
                                                                            6.8
                                                                             14
                                                                              3
                                                                             27
                                                                              4
                                                                             49
                                                                              3

NEW
                                                                            6.2
                                                                             14
                                                                              3
                                                                             28
                                                                              4
                                                                             48
                                                                              4
MOZI1
Measured
                                                                            2.8
                                                                             12
                                                                              3
                                                                             18
                                                                              8
                                                                             57
                                                                              2

IMPROVE
                                                                            4.8
                                                                             13
                                                                              4
                                                                             18
                                                                              8
                                                                             55
                                                                              3

NEW
                                                                            4.1
                                                                             13
                                                                              4
                                                                             17
                                                                              7
                                                                             56
                                                                              3
OKEF1
Measured
                                                                             19
                                                                             21
                                                                              3
                                                                             19
                                                                              3
                                                                             50
                                                                              3

IMPROVE
                                                                             23
                                                                             20
                                                                              3
                                                                             19
                                                                              3
                                                                             52
                                                                              3

NEW
                                                                             21
                                                                             22
                                                                              3
                                                                             20
                                                                              3
                                                                             49
                                                                              3
SHEN1
Measured
                                                                             11
                                                                             27
                                                                             10
                                                                             18
                                                                              4
                                                                             39
                                                                              3

IMPROVE
                                                                             14
                                                                             26
                                                                             10
                                                                             19
                                                                              4
                                                                             38
                                                                              3

NEW
                                                                             13
                                                                             26
                                                                             10
                                                                             19
                                                                              4
                                                                             38
                                                                              3
SHRO1
Measured
                                                                            4.6
                                                                             16
                                                                              2
                                                                             21
                                                                              6
                                                                             53
                                                                              3

IMPROVE
                                                                            8.9
                                                                             19
                                                                              2
                                                                             22
                                                                              4
                                                                             50
                                                                              3

NEW
                                                                            8.0
                                                                             19
                                                                              2
                                                                             21
                                                                              4
                                                                             51
                                                                              3
SNPA1
Measured
                                                                            7.3
                                                                             14
                                                                              5
                                                                             22
                                                                              5
                                                                             49
                                                                              4

IMPROVE
                                                                           10.0
                                                                             13
                                                                              6
                                                                             26
                                                                              5
                                                                             44
                                                                              5

NEW
                                                                            8.7
                                                                             15
                                                                              7
                                                                             25
                                                                              5
                                                                             43
                                                                              5
THSI1
Measured
                                                                            5.4
                                                                             10
                                                                              2
                                                                             23
                                                                              4
                                                                             58
                                                                              3

IMPROVE
                                                                            7.1
                                                                             12
                                                                              3
                                                                             23
                                                                              5
                                                                             54
                                                                              3

NEW
                                                                            6.4
                                                                             11
                                                                              3
                                                                             22
                                                                              4
                                                                             57
                                                                              3
UPBU1
Measured
                                                                             13
                                                                             15
                                                                              4
                                                                             16
                                                                              5
                                                                             57
                                                                              2

IMPROVE
                                                                             14
                                                                             15
                                                                              6
                                                                             17
                                                                              5
                                                                             55
                                                                              2

NEW
                                                                             13
                                                                             15
                                                                              6
                                                                             17
                                                                              5
                                                                             55
                                                                              2

Table A4.  Mean light scattering and percent PM2.5 composition for the five major components for 20% worst days as determined by measurement, the current IMPROVE algorithm and the proposed new algorithm.
Site

Mean Bsp (Mm-1)
Percent Ammonium Sulfate
Percent Ammonium Nitrate
percent OCM
Percent Soil
Percent Coarse
Percent EC
ACAD1
Measured
                                                                             58
                                                                             34
                                                                              6
                                                                             22
                                                                              3
                                                                             32
                                                                              3

IMPROVE
                                                                             59
                                                                             34
                                                                              6
                                                                             21
                                                                              3
                                                                             33
                                                                              3

NEW
                                                                             62
                                                                             34
                                                                              6
                                                                             22
                                                                              3
                                                                             33
                                                                              3
BIBE1
Measured
                                                                             49
                                                                             34
                                                                              2
                                                                             16
                                                                              7
                                                                             39
                                                                              2

IMPROVE
                                                                             44
                                                                             33
                                                                              2
                                                                             15
                                                                              8
                                                                             41
                                                                              2

NEW
                                                                             46
                                                                             33
                                                                              2
                                                                             15
                                                                              8
                                                                             41
                                                                              2
BOWA1
Measured
                                                                             53
                                                                             25
                                                                             13
                                                                             23
                                                                              4
                                                                             32
                                                                              2

IMPROVE
                                                                             49
                                                                             27
                                                                             13
                                                                             22
                                                                              4
                                                                             32
                                                                              2

NEW
                                                                             45
                                                                             23
                                                                             13
                                                                             23
                                                                              4
                                                                             35
                                                                              2
CORI1
Measured
                                                                             56
                                                                             13
                                                                             11
                                                                             25
                                                                              5
                                                                             43
                                                                              3

IMPROVE
                                                                             48
                                                                             13
                                                                             10
                                                                             24
                                                                              5
                                                                             45
                                                                              3

NEW
                                                                             48
                                                                             12
                                                                             10
                                                                             24
                                                                              5
                                                                             46
                                                                              3
DOSO1
Measured
                                                                            109
                                                                             44
                                                                              2
                                                                             21
                                                                              3
                                                                             28
                                                                              2

IMPROVE
                                                                            105
                                                                             47
                                                                              2
                                                                             21
                                                                              3
                                                                             26
                                                                              2

NEW
                                                                            121
                                                                             46
                                                                              1
                                                                             20
                                                                              3
                                                                             29
                                                                              2
GICL1
Measured
                                                                             25
                                                                             18
                                                                              2
                                                                             25
                                                                              8
                                                                             44
                                                                              2

IMPROVE
                                                                             24
                                                                             19
                                                                              2
                                                                             26
                                                                              8
                                                                             43
                                                                              2

NEW
                                                                             23
                                                                             18
                                                                              2
                                                                             26
                                                                              9
                                                                             44
                                                                              2
GRCA2
Measured
                                                                             19
                                                                             16
                                                                              3
                                                                             19
                                                                             11
                                                                             50
                                                                              2

IMPROVE
                                                                             19
                                                                             11
                                                                              2
                                                                             18
                                                                             10
                                                                             57
                                                                              1

NEW
                                                                             18
                                                                             11
                                                                              2
                                                                             18
                                                                             10
                                                                             57
                                                                              1
GRGU1
Measured
                                                                             58
                                                                             35
                                                                              3
                                                                             24
                                                                              3
                                                                             33
                                                                              3

IMPROVE
                                                                             56
                                                                             36
                                                                              4
                                                                             25
                                                                              3
                                                                             30
                                                                              3

NEW
                                                                             59
                                                                             35
                                                                              3
                                                                             26
                                                                              3
                                                                             30
                                                                              3
GRSM1
Measured
                                                                            153
                                                                             52
                                                                              1
                                                                             22
                                                                              3
                                                                             20
                                                                              2

IMPROVE
                                                                            125
                                                                             51
                                                                              1
                                                                             22
                                                                              3
                                                                             21
                                                                              2

NEW
                                                                            163
                                                                             52
                                                                              1
                                                                             22
                                                                              3
                                                                             21
                                                                              2
JARB1
Measured
                                                                             24
                                                                              8
                                                                              3
                                                                             21
                                                                             12
                                                                             54
                                                                              2

IMPROVE
                                                                             21
                                                                              7
                                                                              3
                                                                             20
                                                                             12
                                                                             57
                                                                              1

NEW
                                                                             21
                                                                              7
                                                                              3
                                                                             21
                                                                             12
                                                                             57
                                                                              1
LOPE1
Measured
                                                                             35
                                                                             13
                                                                             14
                                                                             20
                                                                              9
                                                                             41
                                                                              3

IMPROVE
                                                                             33
                                                                             12
                                                                             15
                                                                             20
                                                                              9
                                                                             41
                                                                              3

NEW
                                                                             31
                                                                             11
                                                                             13
                                                                             21
                                                                              9
                                                                             42
                                                                              3
LYBR1
Measured
                                                                             83
                                                                             42
                                                                              8
                                                                             23
                                                                              4
                                                                             21
                                                                              3

IMPROVE
                                                                             75
                                                                             44
                                                                              7
                                                                             21
                                                                              4
                                                                             21
                                                                              3

NEW
                                                                             77
                                                                             45
                                                                              6
                                                                             22
                                                                              4
                                                                             21
                                                                              3
MACA1
Measured
                                                                            106
                                                                             42
                                                                             11
                                                                             23
                                                                              3
                                                                             19
                                                                              3

IMPROVE
                                                                             96
                                                                             42
                                                                              9
                                                                             22
                                                                              3
                                                                             21
                                                                              3

NEW
                                                                            102
                                                                             42
                                                                              7
                                                                             24
                                                                              3
                                                                             21
                                                                              3
MORA1
Measured
                                                                             42
                                                                             20
                                                                              3
                                                                             37
                                                                              5
                                                                             31
                                                                              4

IMPROVE
                                                                             42
                                                                             23
                                                                              4
                                                                             35
                                                                              5
                                                                             30
                                                                              4

NEW
                                                                             42
                                                                             20
                                                                              3
                                                                             37
                                                                              5
                                                                             32
                                                                              4
MOZI1
Measured
                                                                             24
                                                                             15
                                                                              4
                                                                             23
                                                                              8
                                                                             47
                                                                              2

IMPROVE
                                                                             21
                                                                             15
                                                                              4
                                                                             22
                                                                              8
                                                                             49
                                                                              2

NEW
                                                                             20
                                                                             13
                                                                              3
                                                                             24
                                                                              9
                                                                             49
                                                                              2
OKEF1
Measured
                                                                             87
                                                                             31
                                                                              3
                                                                             17
                                                                              4
                                                                             43
                                                                              2

IMPROVE
                                                                             75
                                                                             29
                                                                              3
                                                                             18
                                                                              6
                                                                             42
                                                                              2

NEW
                                                                             76
                                                                             31
                                                                              3
                                                                             17
                                                                              5
                                                                             42
                                                                              2
SHEN1
Measured
                                                                             95
                                                                             46
                                                                              4
                                                                             20
                                                                              4
                                                                             23
                                                                              3

IMPROVE
                                                                             94
                                                                             48
                                                                              5
                                                                             20
                                                                              3
                                                                             22
                                                                              2

NEW
                                                                            108
                                                                             47
                                                                              3
                                                                             21
                                                                              3
                                                                             24
                                                                              2
SHRO1
Measured
                                                                             77
                                                                             36
                                                                              5
                                                                             20
                                                                              7
                                                                             29
                                                                              3

IMPROVE
                                                                             63
                                                                             35
                                                                              3
                                                                             18
                                                                              7
                                                                             35
                                                                              3

NEW
                                                                             62
                                                                             36
                                                                              3
                                                                             20
                                                                              6
                                                                             32
                                                                              3
SNPA1
Measured
                                                                             46
                                                                             17
                                                                              7
                                                                             39
                                                                              5
                                                                             26
                                                                              5

IMPROVE
                                                                             36
                                                                             17
                                                                              7
                                                                             35
                                                                              6
                                                                             31
                                                                              5

NEW
                                                                             37
                                                                             15
                                                                              6
                                                                             37
                                                                              6
                                                                             32
                                                                              5
THSI1
Measured
                                                                             40
                                                                             12
                                                                              3
                                                                             40
                                                                              5
                                                                             38
                                                                              3

IMPROVE
                                                                             34
                                                                             12
                                                                              3
                                                                             36
                                                                              5
                                                                             41
                                                                              3

NEW
                                                                             37
                                                                             12
                                                                              2
                                                                             38
                                                                              5
                                                                             40
                                                                              3
UPBU1
Measured
                                                                            123
                                                                             42
                                                                              3
                                                                             20
                                                                              5
                                                                             27
                                                                              2

IMPROVE
                                                                            104
                                                                             41
                                                                              3
                                                                             20
                                                                              6
                                                                             29
                                                                              2

NEW
                                                                            124
                                                                             43
                                                                              2
                                                                             21
                                                                              5
                                                                             28
                                                                              2