Publication Date
1-31-2008
Document Type
Article
Organizational Units
College of Natural Science and Mathematics, Chemistry and Biochemistry
Keywords
Atmospheric chemistry, Emissions, Pollutants
Abstract
A multi-year, on-road emission measurement program carried out in the cities of Chicago, IL, Denver, CO, Los Angeles, CA and Phoenix, AZ shows large, fuel specific tailpipe emissions reductions at all of the sites for carbon monoxide (CO), hydrocarbons (HC) and nitric oxide (NO). CO emissions decrease between 56% (Denver) and 71% (Chicago), HC emissions decrease between 27% (Phoenix) and 63% (Denver) and NO emissions have dropped between 48% (West LA) and 68% (Chicago). Three observed factors common to all of the sites are that the emission reductions are occurring in vehicles of all ages, that the influence of engine load on fuel specific emissions, especially for CO and NO, is reduced and that fleet averaged emission deterioration is near zero for model years newer than 2001 and older than 1990. These nationwide data sets imply that the majority of these on-road emissions reductions are the result of continued improvements in function and durability of vehicle emission control systems and that inspection and maintenance and fuel reformulation programs have only played a minor role.
Copyright Statement / License for Reuse
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Copyright Date
1-31-2008
Rights Holder
Gary A. Bishop, Donald H. Stedman
Provenance
Received from author
File Format
application/pdf
Language
English (eng)
Extent
28 pgs
File Size
138 KB
Publication Statement
Copyright is held by the American Chemical Society. User is responsible for all copyright compliance.
This is the accepted manuscript for
Bishop, G. A., & Stedman, D. H. (2008). A decade of on-road emissions measurements. Environmental Science & Technology, 42(5), 1651-1656. DOI: 10.1021/es702413b
Publication Title
Environmental Science & Technology
Volume
42
Issue
5
First Page
1651
Last Page
1656
ISSN
1520-5851
Recommended Citation
Bishop, G. A., & Stedman, D. H. (2008). A decade of on-road emissions measurements. Environmental Science & Technology, 42(5), 1651-1656. DOI: 10.1021/es702413b