Environmental

In Missouri, radon gas is a concern primarily because:

AIt contaminates drinking water supplies
BIt is a radioactive gas that can accumulate in basements and is the second leading cause of lung cancer✓ Correct
CIt causes exterior paint to peel
DIt is only found in commercial properties

Explanation

Radon is a naturally occurring radioactive gas that can seep into buildings from soil and rock. Missouri has areas of elevated radon, and it is the second leading cause of lung cancer after smoking. Testing is recommended.

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