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     These maps illustrate the modeled ambient concentration of air toxics by county in 1996. Map colors indicate ranges of median concentration values, and each county is colored according to its value relative to the rest of the country. Note that if a majority of counties have the same value (i.e., for coke oven emissions), most of the map will look white. In addition, for some pollutants (e.g., ethylene dibromide, ethylene dichloride, carbon tetrachloride, and PCBs) the difference in concentrations for many of the color gradients is very small.

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

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