One of the most serious forms of indoor air pollution is ________,a gas that is the natural by-product of the decay of uranium and radium in the soil.

Question

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Radon is a naturally occurring gas that can seep into buildings through cracks in the foundation or walls. It is odorless and colorless, making it difficult to detect without testing. Long-term exposure to high levels of radon has been linked to lung cancer, making it a serious form of indoor air pollution. Formaldehyde, carbon monoxide, and asbestos are also indoor air pollutants, but not as closely associated with serious health risks as radon.

One of the Most Serious Forms of Indoor Air Pollution