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

Red Willow County, Nebraska; Richardson County, Nebraska; and Rock County, Nebraska.  The Red Willow County Seat is McCook, Nebraska; the Richardson County Seat is Falls City, Nebraska; and the Rock County Seat is Bassett, Nebraska.