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

Laramie County, Wyoming; Lincoln County, Wyoming; and Natrona County, Wyoming.  The Laramie County Seat is Cheyenne, Wyoming; the Lincoln County Seat is Kemmerer, Wyoming; and the Natrona County Seat is Casper, Wyoming.