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|| These maps
illustrate the modeled risk in 1996, by county, due to inhalation
of toxic air pollutants. Map colors indicate national ranges of
either estimated lifetime cancer risk or noncancer hazard. A county's
shading color shows how its estimated median risk or hazard level
compares with all other counties in the nation.
The value displayed in maps is either estimated lifetime cancer
risk, expressed as N-in-a-million,
or noncancer hazard, expressed as either hazard
quotient (for individual pollutants) or hazard
index (for multiple pollutants).