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Abstract
The Transportation Analysis and Simulation System, TRANSIMS, contains a vehicle emissions
module that estimates tailpipe emissions for light and heavy-duty vehicles and evaporative emissions
for light-duty vehicles. This paper describes and validates the TRANSIMS emission module and
compares its emission estimates to on-road emission-measurements and other state-of-the-art
emission models. The trend of the emissions estimated in thirteen different runs in each model are
compared. The results indicate that the TRANSIMS model provides consistent trends of estimated
carbon monoxide (CO) and hydrocarbons (HC) with field data trends and inconsistent trends of
estimated nitrogen lxides (NOx). However, the magnitude of the emission estimated in TRANSIMS
is closer to the field data than for other models.