radon in basement 3

https://myradonlevelsstlouiswire.slatecurrent.com/posts/understanding-radon-levels-st-louis-a-guide-for-homeowners

Radon in basement is a serious health concern because this radioactive gas can seep through cracks in the foundation, and it's the second leading cause of lung cancer after smoking. Since you can't see or smell it, the only way to know if your basement has elevated levels is to test it with a simple kit from a hardware store or hire a professional.