The majority of the average yearly radiation exposure from nonmedical sources, for people living in the United States, comes from

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Radon gas is responsible for the majority of the average yearly radiation exposure from nonmedical sources in the United States, accounting for approximately 55% of the total exposure. Radon is a naturally occurring radioactive gas that is formed from the decay of uranium in soil and rocks, and it can seep into homes and buildings through cracks and other openings. Exposure to high levels of radon over a long period of time can increase the risk of lung cancer.

The Majority of the Average Yearly Radiation Exposure from Nonmedical