Radon facts

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Radon is a colorless, odorless, and tasteless radioactive gas that forms naturally from the breakdown of uranium in soil, rock, and water. It seeps into homes through foundation cracks, crawl spaces, sump pits, and other openings, accumulating to dangerous levels if not properly mitigated.

• Radon is the second leading cause of lung cancer in the U.S., after smoking, according to the EPA and Surgeon General.
• The EPA estimates that radon causes about 21,000 lung cancer deaths per year in the U.S. alone.
• Long-term exposure to high radon levels increases the risk of lung cancer, especially for smokers and those with prolonged exposure.

The EPA action level for radon is 4.0 pCi/L (picocuries per liter). Any level above this should be mitigated.