This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Emissions and Age Distribution of Vehicles in the Colorado I/M Program - Winter 1989-1990
Annotation ability available
Sector:
Language:
English
Abstract
Vehicle age distribution is an important consideration when evaluating the effects of exhaust emissions. To quantify CO idle data from motor vehicles of different model year groupings and vehicle classifications, the Colorado Department of Health (CDH) reviewed emissions data from The Colorado Automobile Inspection and Readjustment (A.I.R.) Program.
Colorado's A.I.R. Program is presently in its 9th year and is considered a mature I/M (inspection maintenance) Program. (1) Program data from December 1989, January 1990 and February 1990 were studied to determine the mean % CO by vehicle class and model year group. Classes include: light duty, heavy duty and mixed light and heavy duty (fleet) vehicles. Model year groups include: 1974 and older, 1975-1980, 1981-1982, and 1983 and newer model year vehicles. The 10% highest CO emitting vehicles (by CO emission concentration) in these categories were also evaluated. In addition, percent equipment failure information is presented by classification and age group for all valid I-inspections (initial inspections) and the 10% highest CO emitting vehicles. Carbon monoxide emissions were analyzed using standard Bureau of Automotive Repair (BAR) '84 data obtained during a vehicle's normal emissions test (idle CO). This short test is designed to identify “gross emitting” vehicles which contribute a disproportionate amount of exhaust emissions into our environment and that are in need of adjustment or repair.
Authors
Citation
Gallagher, J. and Livo, R., "Emissions and Age Distribution of Vehicles in the Colorado I/M Program - Winter 1989-1990," SAE Technical Paper 910336, 1991, https://doi.org/10.4271/910336.Also In
References
- Colorado Revised Statute 42-4-306.5-424-316, CRS
- Federal Register 49 114 June 12 1984
- Code of Federal Regulations 40 1987
- “Colorado Air Quality Data Report” Colorado Department of Health 1988
- “Motor Vehicle Tampering Survey-1989 May 1990” U.S. EPA Field Operations and Support Division Office of Mobile Sources Washington, D.C. May 1990
- “A Study of High Altitude Emissions From In-Use High Mileage 1982 and 1983 Model Year Passenger Cars In Denver, Colorado” Colorado Department of Health June 1984
- “A Study of High Altitude Emissions From In-Use 1984 Model Year Passenger Cars In Denver, Colorado” Colorado Department of Health June 1986