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NARSTO Workshop on Innovative Methods for Emission Inventory Development and Evaluation University of Texas, Austin October 14-17, 2003 |
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Analysis of Motor Vehicle Emissions in a Houston Tunnel during the Texas Air Quality Study 2000
Gary R. McGaughey, Nimish R. Desai, and David T. Allen
Center for Energy and Environmental Resources (R7100), The University of Texas at Austin, Austin, TX 78758
Robert L. Seila
U.S. Environmental Protection Agency, Research Triangle Park, NC 27711
William A. Lonneman
National Exposure Research Laboratory, Senior Environmental Employment Program,
U.S. Environmental Protection Agency, Research Triangle Park, NC 27711
Matthew P. Fraser
Department of Environmental Science and Engineering, Rice University, Houston, TX 77005
Robert A. Harley
Department of Civil and Environmental Engineering, University of California, Berkeley, CA 94720-1710
Alison K. Pollack
ENVIRON International Corporation, Novato, CA
Jason M. Ivy and James H. Price
Texas Commission on Environmental Quality (TCEQ ), Austin, TX 78711
Measurements from a Houston tunnel were used to develop fuel consumption based emission factors for CO, NOx, and Non-Methane Organic Compound (NMOC) for on-road gasoline vehicles. The Houston NOx emission factor was at the low range of emission factors reported in previous (primarily pre-1996) tunnel studies while the NMOC emission factor was slightly higher than that reported in the previous tunnel studies. The fuel based tunnel emission factors for CO, NOx and NMOC were compared to emission estimates calculated by the MOBILE5b and MOBILE6 models by making estimates of fuel efficiencies. The MOBILE6 emissions estimate for CO from gasoline vehicles was over twice that provided by the tunnel measurements and predicted by MOBILE5b. NMOC and NOx emission factors based on the tunnel data were consistent with the MOBILE6 estimates.
DISCLAIMER: This is an abstract of a proposed presentation and does not necessarily reflect the United States Environmental Protection Agency (EPA) policy. The actual presentation has not been peer reviewed by EPA. Mention of trade names or commercial products does not constitute endorsement of recommendation for use.