GASEOUS EMISSIONS FROM VEHICLES IN A TRAFFIC TUNNEL IN VANCOUVER, BC

In August 1995, measurements of CO, NOx, speciated nonmethane hydrocarbons (NMHC) and CO2 were made in Vancouver's Cassiar Connector, a 73 m long (2437 ft) level grade highway traffic tunnel. Two characteristics of the Vancouver setting are the presence of many propane vehicles and a mandatory inspection and maintenance (I/M) program. Although the driving conditions and vehicle fleets are otherwise outwardly similar to those of recent Tuscarora tunnel studies, CO/NOx ratios at the Cassiar Connector are significantly lower than those measured at Tuscarora. The Cassiar measurements are consistent with the MOBILESA mobile emissions model predictions. The Canadian version of MOBILESA - known as MOBILE5C - gives nearly identical results, indicating that differences between Canadian and U.S. emission standards cannot explain differences between Cassiar and U.S. tunnels. Considering the modeling results as well as measured ethene/acetylene ratios indicative of noncatalyst vehicles, it appears that vehicle deterioration remains the major issue in in-use vehicle emissions - even in Vancouver, where there is a mandatory loaded-model I/M program. Uncertainties in determining the ages of the vehicles in the tunnel, however, have a significant impact on the model predictions.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/10473289
• Corporate Authors:

  Air & Waste Management Association

  One Gateway Center, 3rd Floor, 420 Fort Duquesne Boulevard
  Pittsburgh, PA  United States  15222
• Authors:
  • ROGAK, S N
  • Pott, U
  • Dann, T
  • Wang, D A
• Publication Date: 1998-7

Language

• English

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: p. 604-614
• Serial:
  • Journal of the Air & Waste Management Association
  • Volume: 48
  • Publisher: Taylor & Francis
  • ISSN: 1096-2247
  • Serial URL: http://www.tandfonline.com/uawm20

Subject/Index Terms

• TRT Terms: Emission control systems; Inspection; Maintenance; Propane; Standards; Tunnels
• Geographic Terms: Canada
• Subject Areas: Bridges and other structures; Highways; Maintenance and Preservation; Vehicles and Equipment;

Filing Info

• Accession Number: 00766458
• Record Type: Publication
• Files: TRIS
• Created Date: Jul 24 1999 12:00AM