radon o'fallon il 3

https://foxtrot-wiki.win/index.php/Understanding_Radon_Edwardsville_IL:_What_Homeowners_Need_to_Know

Radon in O'Fallon, Illinois is a concern for many homeowners, as this radioactive gas can seep into basements from the soil. It's odorless and invisible, so testing is the only way to know if levels are high. Local real estate deals often include radon tests, especially for homes with crawl spaces or sump pumps.