radon gas test 3

https://radonmeasurementpro.slatecurrent.com/posts/why-radon-measurement-matters-for-st.-louis-homeowners

Radon gas tests are pretty simple — you just set a small kit in your basement or lowest living area for a few days, then mail it to a lab. Since radon is a radioactive gas that seeps from the ground and can cause lung cancer, testing is the only way to know if your home has unsafe levels. It's a cheap, low-effort step that gives real peace of mind.