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Radon is an odorless, colorless radioactive gas that comes from the soil. It is formed from the decay of uranium in soil, rocks and even building materials.

And it is a Class A carcinogen.

The EPA has placed a rating for indoor radon screenings measured in pico curies per liter. Homes with an average indoor radon screening level greater than 4 pCi/L are considered the highest potential for radon-induced lung cancer.



High indoor radon concentrations are more frequently found in the northern, eastern, and southeastern parts of New Hampshire. However, values in excess of the US Environmental Protection Agency’s 4.0 picocurie per liter pCi/L) action guideline have been found in nearly every community in New Hampshire. Values exceeding 100 pCi/L have been recorded in at least eight of New Hampshire’s ten counties. The highest indoor radon reading in New Hampshire that we are aware of is greater than 1200 pCi/L; higher values probably exist.