Environmental

Radon is a health hazard because it is:

AA visible gas that indicates mold presence
BA colorless, odorless radioactive gas that can accumulate in buildings and cause lung cancer✓ Correct
CA chemical found in insulation materials
DA byproduct of asbestos degradation

Explanation

Radon is a naturally occurring colorless, odorless radioactive gas that can seep into buildings from soil and rock. Long-term exposure is the second leading cause of lung cancer in the U.S.

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