A summary report is presented of the emission inventory for the Cheyenne, Wyoming Metropolitan Area. The report provides estimates of the present levels of air pollutant emissions and status of their control. The pollutants which include sulfur oxides, oxides of nitrogen, particulates, carbon monoxide, and hydrocarbons are delineated with respect to source type, seasonal variation and geographical distribution within the area. The Study Area which was chosen on the basis of population and air pollution sources, consists of four counties in the southeastern corner of the state of Wyoming. A grid coordinate system was used to show geographic distribution of the emissions within the Study Area. All sources of emissions were classified into five categories: transportation, stationary fuel combustion, solid-waste disposal, industrial processes, and evaporative losses. (Author)