The EKMA was evaluated by comparison with more complex models using common data bases for the San Francisco and Sacramento areas. The basic model used in the EKMA is a simple, moving-air-parcel, or trajectory, model that uses a detailed chemical mechanism for the surrogate propylene and butane hydrocarbons. Time-dependent, precursor-emission factors can be treated, along with expansion of the air parcel, but entrainment is treated by assuming that constant concentrations exist outside the parcel. This basic model is used to generate ozone isopleth diagrams for estimating ozone response to hydrocarbon and nitrogen oxide controls. The comparison study involved several levels of the EKMA system, from parts of the basic model to control strategy predictions. For the San Francisco area, the EKMA was compared with the LIRAQ model, which had been used for the 1979 AQMP. For the Sacramento area, the EKMA was compared with the SAI Airshed Model. When carefully applied, the EKMA produced results that typically agreed with the more complex models. However, the evaluation confirmed that care must be exercised in applying the model to situations involving wind shear, complex terrain features, and highly nonuniform emission densities, and that caution must be used in interpreting the results of model applications to situations involving these factors.

Distributed to depository libraries on microfiche. "Systems Applications, incorporated." "January 1981"--Vol. 1. "May 1981"--Vol. 2. "October 1985"--Vol. 3. Includes bibliographical references.

v. 1. San Francisco/Sacramento / by G.Z. Whitten, H. Hugo and R.G. Johnson -- v. 2. Tulsa / by G/Z. Whitten and H. Hugo -- v. 3. Philadelphia / by Systems Applications, Inc.