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

Sheridan County, Nebraska; Sherman County, Nebraska; and Sioux County, Nebraska.  The Sheridan County Seat is Rushville, Nebraska; the Sherman County Seat is Loup City, Nebraska; and the Sioux County Seat is Harrison, Nebraska.