radon measurement 3

https://getradondetectorzone.publishlane.com/posts/a-homeowner-s-guide-to-choosing-the-right-radon-detector-for-st.-louis-homes

We test for radon in basements and crawl spaces because you can't see or smell the gas. A simple charcoal canister sits for a few days, then you mail it to a lab. Results come back as a number—safe or not. It's cheap and beats guessing.