radon levels st louis 2

https://radonfanreplacementreport.nexorafield.com/posts/signs-your-radon-mitigation-system-needs-a-fan-replacement

Radon levels in St. Louis vary by neighborhood, with some areas showing higher readings due to the region's geology and older home foundations. Testing your basement is a smart move, especially in winter when windows stay shut and gas can accumulate. The EPA recommends action if levels hit 4 pCi/L, but local data shows many homes fall between 2 and 6, so it's worth checking a map or kit to know where you stand.