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

Salt Lake County, Utah; San Juan County, Utah; and Sanpete County, Utah.  The Salt Lake County Seat is Salt Lake City, Utah; the San Juan County Seat is Monticello, Utah; and the Sanpete County Seat is Manti, Utah.