Validation of Mobile Source Emission Estimates Using Mass Balance Techniques |
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| Authors: | Michael W Hlavinka Jerry A Bullin |
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| Institution: | 1. Texas Transportation Institute and Department of Chemical Engineering , The Texas A&2. M University System , College Station , Texas , USA |
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| Abstract: | Air quality models must consider error in the emissions estimates as well as in the model itself. Currently, the accepted method for determining emission factors for mobile sources is through the use of the EPA model MOBILE3. In this paper, emission factor calculations from a technique based on the conservation of mass are presented from experimental data. These emission factors are then compared to MOBILE3 simulations using the experimental conditions and two different methods of obtaining the vehicle scenario. In both cases, the mass balance gave emission factors that were from 1.5 to 2.2 times those predicted by MOBILE3. Next, mass balance and MOBILE3 emission factors were used in the dispersion models CALINE3 and TXLINE in an effort to predict the observed CO concentrations. In both models, enhanced performance was observed when mass balance data were implemented. |
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