Know the radon gas levels in your home

Does your home have dangerously high radon levels?

This pie chart shows the average indoor radon levels in St. Louis County. Green (54 percent) under 2 pCi/L; yellow (25 percent) between 2 and 3.9 pCi/L; and red (21 percent) 4 pCi/L and above. However, the chart does not show where the areas are that...

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