Improved radon gas mapping finds nearly 25% of Americans living in highest risk areas

Researchers from Harvard T.H. Chan School of Public Health have assembled a national database with millions of multi-day indoor radon measurements from 2001 to 2021. Findings reveal that nearly 25% of the U.S. population may be exposed to radon concentrations exceeding 148 Bq/m3, a level associated with cancer risks.

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