This paper presents an overview of the mobile emissions model that has been developed by the Georgia Tech Research Partnership. The model estimates the mobile source production of carbon monoxide, volatile organic compounds, and oxides of nitrogen in space and time. The modeling approach provides a number of distinct modeling advantages: 1) the model is modal in nature, whereby emissions are estimated as a function of vehicle operating modes rather than average vehicle speeds; 2) the model is GIS-based and compatible with hte analytical and decision-making frameworks currently employed by the majority of state departments of transportation and metropolitan planning organizations; 3) the model components are based upon medium term improvemetns in vehicle activity and emissions rate relationships; and 4) model components, assumptions, algorithms, and predictions are being falsified through the collection of real-world data to the greatest extent possible.
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