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

Gilpin County, Colorado; Grand County, Colorado; and Gunnison County, Colorado.  The Gilpin County Seat is Central City, Colorado; the Grand County Seat is Hot Sulphur Springs, Colorado; and the Gunnison County Seat is Gunnison, Colorado.