U.S. Environmental Protection Agency estimates that as many as 1 in 15 homes across the U.S. have elevated radon levels. The overage outdoor levels of radon are 0.4 pCi/L. The average indoor radon levels are 1.3 pCi/L.

Homes across the U.S., The averages above 4.0 pCi/L: 7.0%.

Here, in Wheeling, WV, in Ohio County, the levels are much higher, averaging radon level: 8.0 pCi/L. The averages above 4.0 pCi/L: 45.7%.

In St. Clairsville, in Belmont County, the levels are also much higher, averaging radon level: 7.6 pCi/L. The averages above 4.0 pCi/L: 41.1%.

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