A summary is presented of the emission inventory for the Willamette Valley, Oregon 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, particulates, carbon monoxide, hydrocarbons and nitrogen oxides are delineated with respect to source type, season of the year, and geographical distribution within the area. The study area which was chosen on the basis of the distribution of population and air pollution sources, consists of 10 counties in the State of Oregon which included the cites of Portland, Salem and Eugene and 5 counties in the State of Washington. A grid coordinate system was used to show the geographical distribution of emissions within counties. All sources of emissions were divided into six categories: transportation, stationary fuel combustion, industrial processes, refuse and evaporative losses and miscellaneous combustion. (Author)