The source emission factors presented in this report were compiled primarily for use in conducting an air pollutant emission inventory. The purpose of this compilation of emission factors is to provide the best available substitute to air pollution control agencies unable to conduct extensive source test programs. Factors are included for aircraft emissions, asphalt batching plants, automotive and diesel exhaust emissions, cement production, coffee processing, combustion, (coal, natural gas, oil), concrete batching plants, ferrous and non-ferrous foundries, gasoline evaporation, iron and steel mills, kraft pulp mills, mineral acid manufacture, petroleum refineries, solvent evaporation from dry cleaning plants, and refuse disposal and open burning.