Real-World Vehicle Emissions: A Summary of the Seventeenth Coordinating Research Council On-Road Vehicle Emissions Workshop

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The Coordinating Research Council, Inc. (CRC) held its 17th On-Road Vehicle Emissions Workshop in March 2007, where results of the most recent on-road vehicle emissions research were presented. We summarize ongoing work from researchers who are engaged in improving our understanding of the role and contribution of mobile sources to ambient air quality and emission inventories. Participants in the Workshop discussed efforts to improve mobile source emission models, light- and heavy-duty vehicle emissions measurements, on- and offroad emissions measurements, effects of fuels and lubricating oils on emissions, as well as emerging issues and topics for future research.

INTRODUCTION
The 17th Coordinating Research Council Inc. (CRC) On-Road Vehicle Emissions Workshop was held March 26–
28, 2007, in San Diego, CA. These workshops, which began in 1990, provide a forum for presenting and discussing
the most recent results on improving our understanding of the role and contribution of mobile sources to air quality.

More than 200 representatives from Austria, Belgium, Canada, China, Denmark, Finland, Japan, Korea, Portugal, Sweden, the United Kingdom, and the United States representing industry, government, academia, and consulting groups took part in the Workshop. The objectives of the Workshop were to present the most recent results from research on:

• Emission modeling;
• On-road gasoline and diesel vehicle emissions;
• Off-road emissions;
• Fuel effects on vehicle emissions;
• Measurement methods;
• Particulate matter emissions;
• Portable emission monitoring systems; and
• Emission control measures.

There were 60 presentations in nine sessions, 29 displays in poster sessions, and 8 equipment demonstrations during the Workshop. Brent Bailey, Chris Tennant, and the CRC staff, with Steven Cadle of General Motors (GM) and Mani Natarajan of Marathon Petroleum serving as Workshop co-chairmen, provided Workshop coordination. Robert Sawyer, who at the time was Chairman of the California Air Resources Board (CARB), was the keynote speaker at the Workshop. Session chairs were Fred Minassian of the South Coast Air Quality Management District (SCAQMD), John Koupal of the U.S. Environmental Protection Agency (EPA), Alberto Ayala of CARB, Rob Graze of Caterpillar, Inc., Mani Natarajan, Kevin Black of the Federal Highway Administration (FHWA), Chris Tennant, Hannah Murray from Toyota, and Doug Lawson of the National Renewable Energy Laboratory (NREL).

This paper summarizes presentations given in each session at the Workshop. Summaries of the CRC workshops have been published in the Journal of the Air & Waste Management Association; the three most recent summaries are found in Vol. 55, pp 130-146, Vol. 56, pp 121-136, and Vol. 57, pp 139-145. In addition to the technical papers and posters presented at the Workshop, several vendors provided on-site demonstrations of mobile laboratory and emissions measurement equipment.

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