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Please note: Exposure maps of some pollutants are not very informative because the exposure concentration is dominated by background. See the ambient concentration map for the best information about the variation in concentrations of these pollutants:

  • carbon tetrachloride
  • ethylene dibromide
  • ethylene dichloride
  • PCBs

     These maps illustrate the modeled human exposure to air toxics by county in 1996. Map colors indicate national ranges of inhalation exposure concentration. A county's shading color shows how its exposure concentration compares with all other counties in the nation. Note that if a majority of counties have the same pollutant exposure concentration (e.g., coke oven emissions), most of the map will look white.

The exposure concentration value displayed in maps is the county median. Exposure concentration is expressed in micrograms of pollutant per cubic meter of air (µg/m3).

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