Emission Factors for Gas-Powered Vehicles Traveling Through Road Tunnels in São Paulo, Brazil

The objective of this study was to improve the vehicular emissions inventory for the light- and heavy-duty fleet in the metropolitan area of São Paulo (MASP), Brazil. To that end, we measured vehicle emissions in road tunnels located in the MASP. On March 22-26, 2004 and May 04-07, 2004, respectively, CO, CO2, NOx, SO2, and volatile organic compounds (VOCs) emissions were measured in two tunnels: the Janio Quadros, which carries light-duty vehicles; and the Maria Maluf, which carries light-duty vehicles and heavy-duty diesel trucks. Pollutant concentrations were measured inside the tunnels, and background pollutant concentrations were measured outside of the tunnels. The mean CO and NOx emission factors (in g km-1) were, respectively, 14.6 ± 2.3 and 1.6 ± 0.3 for light-duty vehicles, compared with 20.6 ± 4.7 and 22.3 ± 9.8 for heavy-duty vehicles. The total VOCs emission factor for the Maria Maluf tunnel was 1.4 ± 1.3 g km-1. The main VOCs classes identified were aromatic, alkane, and aldehyde compounds. For the heavy-duty fleet, NOx emission factors were approximately 14 times higher than those found for the light-duty fleet. This was attributed to the high levels of NOx emissions from diesel vehicles. (A)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/0013936X
• Authors:
  • MARTINS, L D
  • ANDRADE, M F
  • FREITAS, E D
• Publication Date: 2006

Language

• English

Media Info

• Pagination: 6722-6729
• Serial:
  • Environmental Science & Technology
  • Volume: 40
  • Issue Number: 21
  • Publisher: American Chemical Society
  • ISSN: 0013-936X
  • EISSN: 1520-5851
  • Serial URL: http://pubs.acs.org/journal/esthag

Subject/Index Terms

• TRT Terms: Diesel engines; Environment; Pollutants; Pollution; Tunnels; Vehicles
• Geographic Terms: Brazil
• Subject Areas: Bridges and other structures; Energy; Environment; Vehicles and Equipment; I15: Environment;

Filing Info

• Accession Number: 01040957
• Record Type: Publication
• Source Agency: TRL
• Files: ITRD
• Created Date: Jan 17 2007 9:10AM