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Radon

Radon is a naturally occurring radioactive gas that is given off by some types of rock and soil. Radon has no color or odor. It can seep into basements and the lower floors of buildings. Radon exposure is the second leading cause of lung cancer in this country. A radon detector sounds an alarm when levels of the gas in indoor air become to high. If radon is present, increasing a building's ventilation can eliminate any damaging effects. This requires the attention of experts.

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Q: Which indoor air pollutant is radioactive?
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