Environmental
Radon is a naturally occurring radioactive gas that comes from:
AOld paint and building materials
BThe natural decay of uranium in soil and rock beneath homes✓ Correct
CIndustrial emissions from nearby factories
DOld plumbing systems with lead pipes
Explanation
Radon is a colorless, odorless radioactive gas produced by the natural decay of uranium in soil, rock, and water. It can enter homes through foundation cracks and accumulate to dangerous levels. EPA recommends mitigation if radon exceeds 4 pCi/L.
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