Emissions of Light-Duty Vehicles with Respect to Cruising Speed under Real-World Driving Conditions
Publication: Journal of Environmental Engineering
Volume 141, Issue 7
Abstract
Mobile-source emission inventories in countries such as Mexico still require empirical data to complement modeling tools because these tools are based on few local observations. In this study, emission factors (EFs) were determined for 10 light-duty gasoline-powered vehicles as a function of cruising speed under real-world driving conditions typical of the Monterrey metropolitan area, the third largest urban center in Mexico. Greater variability in the EF was found when the vehicles were operated at lower speeds, specifically at ; however, above , the changes were marginal. Engine size was the factor that most influenced the emissions of , which were significantly greater in vehicles with an engine size above 2 L. A reduction trend in the ratio of newer model vehicles was observed. Upon comparison of the experimental results with the results obtained from the MOBILE6.2-Mexico and the MOVES 2010a models, it was determined that the latter model better described the values of the EFs, the emission profile as a function of speed, and the ratio of the tailpipe gases.
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Acknowledgments
This research was supported by the Tecnológico de Monterrey through grant number CAT-186. Hector E. Carrera and Jessica Portillo received additional support (scholarship) through the Mexican Council for Science and Technology (CONACYT).
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Information
Published In
Journal of Environmental Engineering
Volume 141 • Issue 7 • July 2015
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Sep 12, 2014
Accepted: Dec 5, 2014
Published online: Jan 13, 2015
Discussion open until: Jun 13, 2015
Published in print: Jul 1, 2015
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