Radon gas risk often goes unnoticed because it's odorless and invisible, but it's the second leading cause of lung cancer after smoking. This radioactive gas seeps from the ground into homes through cracks in foundations, especially in basements and crawl spaces. Testing is the only way to know if your home has elevated levels, and the EPA recommends mitigation if levels reach 4 pCi/L or higher. It's not just about older houses; radon can accumulate in newer, tighter homes too, so checking is a… radon gas risk 8