Environmental

Radon is a naturally occurring gas that:

AIs easily detected by smell
BIs a colorless, odorless radioactive gas that can accumulate in buildings✓ Correct
CIs only found in commercial properties
DIs harmless at all levels

Explanation

Radon is a colorless, odorless, radioactive gas formed by the decay of uranium in soil and rock; it can enter buildings through cracks and is a leading cause of lung cancer.

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