radon health risk
https://fun-wiki.win/index.php/Why_a_Radon_Reduction_System_Matters_for_West_St._Louis_County_Homes
Radon is a naturally occurring radioactive gas that can seep into homes from the ground, posing a serious health risk over time. It's the second leading cause of lung cancer after smoking, and many people don't realize they may have elevated levels. Testing your home is simple and can help you take steps to reduce exposure.