Radon
Radon is a naturally occurring, colorless, odorless, radioactive gas. It can affect indoor air quality and may cause lung cancer. Because the radon molecule is heavier than air, it may accumulate in the lowest area of our homes -- the basement. If you use your basement regularly or allow the kids to play or sleep there, it's a good idea to have the area tested for radon.
Click here for information from the EPA about radon testing. See links below the map for more information.
On the map of Indiana, RED indicates the highest risk for radon exposure (counties having a predicted average indoor radon screening level greater than 4 pCi/L [pico curies per liter]). Notice that Harrison County is red on this map. ORANGE indicates a moderate risk (counties having a predicted average indoor radon screening level between 2 and 4 pCi/L).
From the US Environmental Protection Agency: