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The average radon level in Minnesota is 4.4 pCi/L, which is more than three times higher than the average U.S. radon level of 1.3 pCi/L. Any radon level poses some health risks. The best approach is to lower the radon level as much as possible. The Environmental Protection Agency recommends installing a radon mitigation system if your radon level is 4 pCi/L or higher/
Radon Indoor Air Quality