Abstract: The Environmental Protection Agency (EPA) compiles data on emission tonnages of air pollutants for US counties.  US Air Quality Gradebook ("AirGrades") source sheets give the percentage contributions from specific air pollution sources.  This source sheet is for

Douglas County, Nebraska; Dundy County, Nebraska; and Fillmore County, Nebraska.  The Douglas County Seat is Omaha, Nebraska; the Dundy County Seat is Benkelman, Nebraska; and the Fillmore County Seat is Geneva, Nebraska.