Application of a Simple Model of Photochemical Smog
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Application of a Simple Model of Photochemical Smog

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    The simple ATDL dispersion model is extended to predict concentrations of chemically reactive pollutants. The concentrations in the governing equations are non-dimensionalized by using as a scaling factor the concentration predicted by the simple model for inert pollutants. As a result, the influence of any given set of reactions on the system, however complex, can be easily analyzed by examining a set of dimensionless parameters. If these parameters are all less than about 0.1, then chemical reactions are not important and the simple model prediction is valid. The relative importance in any pollution problem of wind speed, source strengths, and atmospheric stability can be assessed. The model is used to estimate hourly concentrations of CO, NO, NO^, and reactive hydrocarbons at eight stations in the Los Angeles basin for the time period 6 a.m. - 12 noon on 30 September 1969. It is seen that the estimates of CO, NO, and reactive hydrocarbons agree fairly well with observations (correlation coefficients range from .43 to .99), but that the estimates of N0o are inconsistent with the observations (correlation coefficients range from -.80 to .78).
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