The Implementation Planning Program is a group of computer simulation models designed to assist the air quality control regions in developing meaningful air pollution control strategies. Through application of simulation techniques, the Program is used in selecting appropriate emission standards, evaluating the resulting air quality, and determining the costs associated with the various alternative control strategies. There are certain operational restrictions. The control regulations, or emission standards, are restricted to stationary sources of pollution, although the program accounts for the effects of control regulations on mobile emissions. At present the computer simulation takes into consideration only two pollutants, sulfur oxides and suspended particulate matter.