Potential Radon Exposure from Groundwater & Indoor Air in Pennsylvania

This map shows selected geologic units in Pennsylvania and associated potential radon exposure from groundwater and indoor air, based on statistical modeling using measured radon concentrations and other information. This is figure 7 in Gross, E.L., 2017, Evaluation of radon occurrence in groundwater from 16 geologic units in Pennsylvania, 1986–2015, with application to potential radon exposure from groundwater and indoor air: U.S. Geological Survey Scientific Investigations Report 2017–5018, 24 p., https://doi.org/10.3133/sir20175018.