Levels in Iowa
The U.S. Environmental Protection Agency capped the allowable radon level for safe buildings at 4.0 picoCuries per liter of air — which is the unit of measurement used to measure the amount of radon in the air.
Iowa has the highest average levels of radon in the nation, according to the EPA. Iowa falls into the EPA radon red zone, which means every county has a predicted average indoor radon screening level greater than the suggested 4.0 picoCuries per liter. Johnson County's levels are estimated to be 4.4 picoCuries per liter, which is lower than most surrounding counties but more than three times greater the national average radon concentration.
SOURCE: Bill Field, UI Occupational and Environmental Health professor and national radon expert
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