Environmental

What is radon?

AA chemical used in older insulation
BA colorless, odorless radioactive gas that can accumulate in buildings✓ Correct
CA type of mold found in wet climates
DA soil contaminant from industrial use

Explanation

Radon is a naturally occurring colorless, odorless radioactive gas that comes from the decay of uranium in soil. It can seep into buildings and is a leading cause of lung cancer.

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