Environmental
Radon is a naturally occurring radioactive gas that enters buildings primarily from:
AOld lead-based paint on walls and ceilings
BThe soil and rock beneath the structure✓ Correct
CUnderground storage tanks on adjacent properties
DFormaldehyde off-gassing from building materials
Explanation
Radon (a decay product of uranium in soil and rock) seeps up through the ground and into buildings through foundation cracks, sumps, and openings. Basements and lower floors typically have the highest concentrations.
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