In the study, "High-resolution national radon maps based on massive indoor measurements in the United States," published in the Proceedings of the National Academy of Sciences, researchers ...

MDH created the new interactive county radon maps and charts using five years of data from 2010-2014 with more than 86,000 properties tested. The analysis found that properties in 78 percent of ...

The bad: A map developed by the Department of Health shows how 40 percent of the state’s homes have dangerous levels of radon. In McLeod County, the rate is even higher, between 54 and 67 percent.