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The objective of this program is to characterize mobile source emissions which are one of the largest sources of tropospheric ozone precursor emissions (CO, NOx, and volatile organic compounds (VOCs) in the U.S. Due to the dynamic operation of motor vehicles, emissions are highly variable as a function of the mode of operation which is influenced by the driver, the type of vehicle, the roadway grade and the passenger or other load carried or pulled by the vehicle. As a consequence, the spatial distribution of emissions from one of the largest sources of ozone presursor emissions is poorly understood. Although average emissions over several square miles may be estimated by existing models, these models are not adequate for evaluating highway design and traffic effects. This program is researching and developing a new modal emissions model that can give detailed analyses of highway transportation control systems and is expected to provide important input on the effectiveness of future highway intelligent control systems. For additional information regarding this research area, visit the website at http://www.epa.gov/appcdwww/crb/apb/mobile.htm. To access directly from this website, click on the downloads on the navigation bar.

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