Environmental

Radon gas enters buildings primarily through:

AContaminated municipal water supply
BCracks in floors, walls, and foundations from the soil beneath✓ Correct
COld lead paint on interior surfaces
DAsbestos fibers in ceiling tiles

Explanation

Radon is a naturally occurring radioactive gas produced by the decay of uranium in soil and rock. It enters buildings through cracks and openings in the foundation. It is the second leading cause of lung cancer in the U.S.

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