radon in basement 5

https://extra-wiki.win/index.php/Understanding_Radon_Levels_St_Louis_Homeowners_Should_Know

Radon in basement is a silent hazard that often goes unnoticed because it's colorless and odorless. This radioactive gas seeps through cracks in the foundation, accumulating in low-lying areas. Testing is the only way to know if levels are dangerous, and mitigation can involve sealing entry points or installing a ventilation system. It's not something to panic about, but it is worth taking seriously for long-term health.