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

Larimer County, Colorado; Las Animas County, Colorado; and Lincoln County, Colorado.  The Larimer County Seat is Fort Collins, Colorado; the Las Animas County Seat is Trinidad, Colorado; and the Lincoln County Seat is Hugo, Colorado.