FACT SHEET
 PURPOSE:
 •0-       Sections 307 & 309 of IRAA directed EPA to list and identify areas of U.S. with the potential for elevated indoor radon
          levels

 •$•       EPA's Map of Radon Zones assigns each of the 3141 counties in the United States to one of three zones based on radon
          potential:

          * Zone 1 counties have a predicted average indoor screening level greater than 4 pCi/L (red)
          * Zone 2 counties have a predicted average screening level between 2 and 4 pCi/L (orange)
          * Zone 3 counties have a predicted average screening level less than 2 pCi/L (yellow)

 AUDIENCES:

 •$•      National, State and local governments and organizations
         - to assist in targeting their radon program activities and resources

 •$•      Building code officials
         - to help determine areas that are the highest priority for adopting radon-resistant building practices

 MAP DEVELOPMENT:

 •$•      Five Factors were used to determine radon potential
         - indoor radon measurements, geology, aerial radioactivity, soil permeability and foundation type.

 •^      Radon potential assessment is based on geologic provinces
         - Radon Index Matrix is the quantitative assessment of radon potential                                '
         - Confidence Index Matrix shows the quantity and quality of the data used to assess radon potential

 4-      Geologic Provinces were adapted to county boundaries for the Map of Radon Zones

MAP DOCUMENTATION:

•$•      Detailed booklets are available for every State:
         - Booklets discuss the matrices and data used in every State

•$•      State booklets are an essential tool in employing the maps' information

IMPORTANT POINTS:
        All homes should test for radon, regardless of geographic location or zone designation.

        There are many thousands of individual homes with elevated radon levels in Zones 2 and 3...
        Elevated levels can be found in Zone 2 and Zone 3 counties'
                                                         i    •                                       '
        All users of the map should carefully review the map documentation for information on within-county variations
        in radon potential and supplement the map with locally available information before making any decisions

        The map is not to be used in lieu of testing during real estate transactions.

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