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

Ouray County, Colorado; Park County, Colorado; and Phillips County, Colorado.  The Ouray County Seat is Ouray, Colorado; the Park County Seat is Fairplay, Colorado; and the Phillips County Seat is Holyoke, Colorado.