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EMPIRICAL MODEL OF VEHICLE EMISSIONS
Citation:
Pitchford, M. AND B. Johnson. EMPIRICAL MODEL OF VEHICLE EMISSIONS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-93/201.
Description:
An empirical model that characterizes the relationship between equilibrium vehicle emission distributions and malfunction, repair, and replacement rates by splitting vehicles into two emission categories has been developed. ross emitters and clean vehicles are defined by the magnitude of their emissions compared to an arbitrarily chosen cut point. he model is used to predict emission changes resulting from changes in any of the three rates, by determining the new equilibrium distribution of vehicles. emotely sensed vehicle emission measurements made in Las Vegas, Nevada, are used to demonstrate the capabilities of the model to evaluate various inspection and maintenance (I/M) program options. he emission cut point forrepair is shown to establish the cost per tone of reduction, and the maximum emission reduction limit while the frequency of repair determines the amount of emission reduction up to the cut-point determined limit.