The U.S. Environmental Protection Agency (EPA) estimates that radon is responsible for approximately 21,000 lung cancer deaths in the United States each year. This means about one death every 25 minutes, making it the second leading cause of lung cancer overall and the leading cause among non-smokers.
Why Radon Is Dangerous
Radon forms naturally when uranium in soil and rock breaks down. It can enter homes through cracks, gaps, or drains — especially in basements or lower levels. When trapped indoors, radon builds up to unsafe levels and, over time, damages lung tissue, increasing the risk of lung cancer.
- Radon is a major health risk: Radon is a naturally occurring, odorless, and colorless radioactive gas that can accumulate in homes.
- It is the leading cause of lung cancer in non-smokers: For people who have never smoked, radon is the number one cause of lung cancer.
- It increases risk for smokers: For smokers, the risk of lung cancer from radon exposure is significantly higher—about 10 times greater than for non-smokers.
- The risk is cumulative: The risk increases with both higher concentrations of radon and longer exposure times.
Is Your Home Safe
The EPA estimates that 1 in 15 U.S. homes has elevated radon levels.
You should test your home if:
- Don’t know your current radon level
- Have remodeled or finished your basement
- Are buying or selling a home
- Spend significant time in your basement or lower level
How To Test Your Home
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Purchase a radon test kit at most hardware stores or online
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Hire a professional tester or purchase a continuous radon monitor for ongoing readings
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If high levels are detected, hire a certified radon mitigation professional to install a system that vents radon safely outdoors