A recent study published in PNAS (June 2024) presents the first high-resolution, monthly mapping of indoor radon concentrations across the United States from 2001 to 2021. Researchers analyzed over 6 million indoor radon measurements and combined nearly 200 environmental, geological, meteorological, and housing variables using machine learning. This method provides detailed, community-level radon risk predictions with far greater accuracy than previous broad-zone maps.
- Key finding: About 25% of the U.S. population—more than 83 million people—live in homes with indoor radon levels above 4 picocuries per liter (pCi/L) (the U.S. Environmental Protection Agency action level).
North Dakota stands out as one of the highest radon risk states:
- The last 10-year average indoor radon level in North Dakota is about 7.7 pCi/L.
- All counties in Norh Dakota are rated EPA Zone 1 (highest risk).
University of North Dakota’s Radon Efforts:
The University of North Dakota (UND) recently received a $0.5M grant from the U.S. Department of Housing and Urban Development to research and address the radon problem in the state.
Why It Matters:
The U.S. Environmental Protection Agency says radon is the leading cause of lung cancer in people who don’t smoke. Overall, it’s the second biggest cause of lung cancer.
SunRadon Radon Testing Services:
SunRadon provides measurement and monitoring equipment for residential and professional radon testing. Their monitoring instruments offer real-time indoor radon data that can be accessed easily on all smartphones. Use the coupon code HEALTHYAIR to receive special, discounted pricing for eligible product purchases.
Author: Mohamed Hersi, a registered Environmental Engineer (P.E.)
THE CATALYST 
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