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

Hinsdale County, Colorado; Huerfano County, Colorado; and Jackson County, Colorado.  The Hinsdale County Seat is Lake City, Colorado; the Huerfano County Seat is Walsenburg, Colorado; and the Jackson County Seat is Walden, Colorado.