On-Road Remote Sensing of Vehicle Emissions in Mexico
Publication Date
11-26-1997
Document Type
Article
Organizational Units
College of Natural Science and Mathematics, Chemistry and Biochemistry
Keywords
Atmospheric chemistry, Emissions, Pollutants
Abstract
In 1991, the nation of Mexico lowered light-duty vehicle emission standards leading to the introduction of catalytic convertors. On-road emissions were measured in Monterrey, Nuevo Léon, Mexico in 1995 from more than 24 000 vehicles. The Subsecretaría de Ecología's Office was able to provide vehicle registration information for 10 654 vehicles. These data show a steady emission reduction that coincides with the introduction of light-duty vehicle exhaust emission standards for Mexican vehicles and the implementation of Monterrey's I/M program. The 1995 models are emitting 75% less CO, 70% less HC, and 65% less NO than precontrol models. Pre-1995 models appear to experience a steady degradation in their emission control capabilities, but the cause of this observation cannot reliably be determined without additional data. Comparisons to other locations reveal that Monterrey and Mexico City have improved their fleet emissions when compared to Juárez despite a shorter time with access to vehicles manufactured with emission control systems. The Monterrey data set can also be used to help explain some of the large on-road reductions observed in Mexico City between 1991 and 1994. Sweden's experience in introducing three-way closed-loop emission control systems suggests that the service life of Mexican vehicle emission control systems can be improved.
Copyright Statement / License for Reuse
All Rights Reserved.
Copyright Date
11-26-1997
Rights Holder
American Chemical Society
Provenance
Received from author
Language
English (eng)
Extent
6 pgs
Publication Statement
Copyright is held by the American Chemical Society. User is responsible for all copyright compliance.
Publication Title
Environmental Science and Technology
Volume
31
Issue
12
First Page
3505
Last Page
3510
ISSN
1520-5851
Recommended Citation
Bishop, G. A., Stedman, D. H., De La Garza Castro, J., & Davalos, F. J. (1997). On-road remote sensing of vehicle emissions in Mexico. Environmental Science & Technology, 31(12), 3505-3510. DOI: 10.1021/es9702475