Environmental

Radon gas in Arizona homes enters primarily through:

AAsbestos insulation in walls
BCracks and openings in the foundation from uranium-rich soil✓ Correct
CHVAC ductwork from neighboring properties
DContaminated municipal water supplies

Explanation

Radon is a naturally occurring radioactive gas produced by the decay of uranium in soil and rock. It typically enters homes through cracks and openings in the foundation. Arizona has areas with elevated radon potential.

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