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

San Juan County, Colorado; San Miguel County, Colorado; and Sedgwick County, Colorado.  The San Juan County Seat is Silverton, Colorado; the San Miguel County Seat is Telluride, Colorado; and the Sedgwick County Seat is Julesburg, Colorado.