Environmental

Radon is a naturally occurring radioactive gas that enters buildings primarily through:

AWater supply systems
BCracks and openings in foundations from the soil below✓ Correct
COld lead paint on walls
DAsbestos-containing insulation

Explanation

Radon is produced by the decay of uranium in soil and rock. It enters buildings through cracks, gaps, and openings in the foundation from the soil below. Basements and lower floors typically have the highest concentrations.

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