Abstract: The Environmental Protection Agency (EPA) compiles data on emission tonnages of air pollutants for US counties.  US Air Quality Gradebook ("AirGrades") source sheets such as this one for Cleburne County, Arkansas, and

Cleveland County, Arkansas, give the percentage contributions from specific air pollution sources.  The Cleburne County Seat is Heber Springs, Arkansas, and the Cleveland County Seat is Rison, Arkansas.