What percentage of homes nationwide are estimated to have radon levels at or above 4 pCi/l?

The estimation that approximately 1 in 15 homes nationwide have radon levels at or above 4 pCi/l is based on research and surveys conducted by health organizations, including the U.S. Environmental Protection Agency (EPA). The EPA has indicated that this level is significant because it is the threshold at which action should be taken to reduce radon exposure due to its associated health risks, particularly lung cancer.

This statistic reflects a national average and underscores the importance of radon testing in homes, especially in areas known for higher radon concentrations. Understanding this prevalence helps the public and professionals in the field emphasize the necessity for regular radon testing and mitigation efforts in homes.