A Decade of On-road Emissions Measurements
- 31 January 2008
- journal article
- research article
- Published by American Chemical Society (ACS) in Environmental Science & Technology
- Vol. 42 (5), 1651-1656
- https://doi.org/10.1021/es702413b
Abstract
A multiyear, on-road emission measurement program carried out in the cities of Chicago, Illinois; Denver, Colorado; Los Angeles (LA), California; and Phoenix, Arizona shows large, fuel-specific tailpipe emissions reductions at all of the sites for carbon monoxide (CO), hydrocarbons (HC), and nitric oxide (NO). CO emissions decreased 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.Keywords
This publication has 13 references indexed in Scilit:
- Effects of Reformulated Gasoline and Motor Vehicle Fleet Turnover on Emissions and Ambient Concentrations of BenzeneEnvironmental Science & Technology, 2006
- Spectroscopy Applied to On-Road Mobile Source EmissionsApplied Spectroscopy, 2006
- Changes in Motor Vehicle Emissions on Diurnal to Decadal Time Scales and Effects on Atmospheric CompositionEnvironmental Science & Technology, 2005
- Emissions Reductions as a Result of Automobile ImprovementEnvironmental Science & Technology, 2003
- Development of a High-Speed Ultraviolet Spectrometer for Remote Sensing of Mobile Source Nitric Oxide EmissionsJournal of the Air & Waste Management Association, 1999
- Scaling of Infrared Remote Sensor Hydrocarbon Measurements for Motor Vehicle Emission Inventory CalculationsEnvironmental Science & Technology, 1998
- On-Road Evaluation of an Automobile Emission Test ProgramEnvironmental Science & Technology, 1997
- Automobile Emissions Are Statistically Gamma DistributedEnvironmental Science & Technology, 1994
- Emissions from lit-use Motor Vehicles in Los Angeles: A Pilot Study of Remote Sensing and the Inspection and Maintenance ProgramJournal of the Air & Waste Management Association, 1990
- Ozone Formation in Photochemical Oxidation of Organic SubstancesIndustrial & Engineering Chemistry, 1953