radon health risk 3

https://getradonlevelsstlouiscountypro.quillnesty.com/posts/understanding-radon-levels-st-louis-county-what-west-county-homeowners-need-to-know

Radon is a naturally occurring radioactive gas that seeps into homes from the ground, often going unnoticed until it becomes a serious health risk. Long-term exposure damages lung tissue and is a leading cause of lung cancer, especially for smokers. Testing your home is the only way to know if levels are high.