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

Cowlitz County, Washington; Douglas County, Washington; and Ferry County, Washington.  The Cowlitz County Seat is Kelso, Washington; the Douglas County Seat is Waterville, Washington; and the Ferry County Seat is Republic, Washington.