radon
Definition
Naturally occurring colorless, odorless, and chemically inert but radioactive gas present (in varying amounts) in all soils and groundwater, and which occurs due to decay of uranium atoms over time. It enters homes through cracks and opening in concrete slabs and pores in hollow concrete blocks. Although exposure to radon produces no immediate symptoms, it is classified as a known carcinogen by the US Environmental Protection Agency (EPA).
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