Winter is good time to measure radon in home Submitted story Submitted graphic This graphic shows the average levels of radon by county in Ohio. The U.S. Surgeon General and Environmental Protection Agency recommend fixing homes with radon levels at or above 4pCi/L. On average, properties in Champaign County exceed that level. Counties with high averages of radon are colored in red on this map. Submitted graphic Editor’s note: This is part of an ongoing series from the Champaign Health District to educate local residents about the risks of radon in their homes. The Champaign Health District is encouraging local residents to consider the effects radon could have on their home environments and their health.