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Type: Artigo de periódico
Title: Emission factors for gas-powered vehicles traveling through road tunnels in Sao Paulo, Brazil
Author: Martins, LD
Andrade, MF
D Freitas, E
Pretto, A
Gatti, LV
Albuquerque, EL
Tomaz, E
Guardani, ML
Martins, MHRB
Junior, OMA
Abstract: The objective of this study was to improve the vehicular emissions inventory for the light- and heavy-duty fleet in the metropolitan area of Sao 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, CO(2), NO(x), SO(2), 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 NO(x) 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, NO(x) emission factors were approximately 14 times higher than those found for the light-duty fleet. This was attributed to the high levels of NO(x) emissions from diesel vehicles.
Country: EUA
Editor: Amer Chemical Soc
Citation: Environmental Science & Technology. Amer Chemical Soc, v. 40, n. 21, n. 6722, n. 6729, 2006.
Rights: fechado
Identifier DOI: 10.1021/es052441u
Date Issue: 2006
Appears in Collections:Unicamp - Artigos e Outros Documentos

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