Abstract
A three-dimensional numerical simulation model for solving the urban scale atmospheric diffusion equation and photochemical reactions was developed to study the relationship between emission sources and air quality in Southern California. Air flow velocities at the grids were computed using the observed data base that was offered by the California Air Resource Board. The LCC model was employed as the photochemical reaction model, in which 35 chemical species and 105 chemical reactions were considered. Among the four categories of sources, i. e., mobile, point, area, and biogenic sources, the mobile source was found to contribute about 50% to ozone formation, and there is the posssibility of reducing maximum ozone concentration by 25% when it is eliminated. Futhermore, replacing previous passenger vehicles with 1994 models was found to possibly reduce ozone concentration by a maximum of 14%.
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