Average Indoor Radon in the
United States by County
These average radon values were produced by the high radon project of Lawrence Berkley National Laboratory from a semi-empirical model that used short and long-term radon measurements and surface radon progeny concentrations. For details see http://eetd.lbl.gov/IEP/high-radon/hr.html .
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Last revised : 27 October, 2006
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