EPA AirData sample

County Air Quality Map -
criteria air pollutants

Map shading indicates which counties conducted monitoring, and whether each county's peak annual pollutant concentration was below or above the applicable national air quality standard. Alternatively, the map can show the number of days per year a county's Air Quality Index reached an unhealthy category. A bar chart beside the map shows the total population of counties in the map and population subtotals for several levels of county peak annual value.

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