radon levels st louis county 3

https://radonhomesaledaily.pinehavenscope.com/posts/why-radon-home-sale-testing-matters-for-west-st.-louis-county-sellers

Radon levels in St. Louis County vary by neighborhood because of the region's underlying geology, especially karst limestone and glacial deposits. I test my own basement every couple of years—some homes just a few miles apart can have very different readings, so it's smart to check rather than assume.