radon edwardsville il 2
https://theradontestresultslab.northstarcolumn.com/posts/understanding-your-radon-test-results-what-metro-east-illinois-homeowners-need-to-know
Radon in Edwardsville, IL is a real concern since the area's soil and geology can allow the gas to seep into homes. I know several neighbors who tested their basements and found levels above the EPA action limit. It's not something to panic over, but testing is cheap and easy, and fixing it can be straightforward. Just something to be aware of if you're buying or living in a house here.