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

Merrick County, Nebraska; Morrill County, Nebraska; and Nance County, Nebraska.  The Merrick County Seat is Central City, Nebraska; the Morrill County Seat is Bridgeport, Nebraska; and the Nance County Seat is Fullerton, Nebraska.