| Abstract |
Annual pollutant emissions of particulates, sulfur dioxide, nitrogen oxides, hydrocarbons, and carbon monoxide from point and area sources are apportioned to 80-km grid squares on a 35 by 30 grid network. The grid network is a polar stereographic projection true to 60 degrees N. The domain of the network includes southern Canada and much of the United States east of the Rocky Mountains. Southern Texas and northern New England are omitted. In addition, the emissions of the five pollutants are apportioned to 20-km grid squares on a 40 by 40 grid network, which is a subset of the previously mentioned grid network. The domain of the 40 by 40 grid network encompasses the area roughly from Columbus, Ohio to Portland, Maine and from Richmond Virginia to Ottawa, Ontario. The emission data were obtained from the 1977 Environmental Protection Agency National Emissions Data System (NEDS) file as well as from data compiled by the Ontario Ministry of the Environment and Environment Canada. These emission inventories, the design of the gridding procedures, and the major source classifications responsible for much of the emissions are discussed. The emission grids are presented in both figure and tabular forms. |
