Why Are Radon Levels So High In Iowa?
Thousands of years ago when the glaciers came through America, they deposited a great deal of radium and uranium that got ground deep into our soil. It is now at the right age that it is decaying and releasing radon gas. Iowa is the worst state in the nation for radon – 3 out of 4 houses in Iowa are above the EPA action threshold of 4 pCi/L.