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

Clear Creek County, Colorado; Conejos County, Colorado; and Costilla County, Colorado.  The Clear Creek County Seat is Georgetown, Colorado; the Conejos County Seat is Conejos, Colorado; and the Costilla County Seat is San Luis, Colorado.