The radioactive gas that poses an indoor air-pollution problem is

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Radon is a radioactive gas that can accumulate in indoor spaces, leading to a potential health hazard. It is produced naturally by the decay of uranium in soil, rock, and water, and can seep into buildings through cracks and gaps in the foundation, walls, and floors. Long-term exposure to radon has been linked to a higher risk of lung cancer, particularly in smokers or those with preexisting respiratory conditions. Therefore, it is important to test for radon levels in homes and take steps to reduce or eliminate the gas if necessary.

The Radioactive Gas That Poses an Indoor Air-Pollution Problem Is