radon measurement 4

https://myhomeradontestzone.swiftnestly.com/posts/why-a-home-radon-test-matters-for-st.-louis-homeowners

When I tested my basement for radon, I learned this invisible gas comes from the natural breakdown of uranium in soil and can seep through cracks in foundations. A simple charcoal test kit left for a few days gave me a reading, and I was relieved to find it was below the recommended action level.