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Effectiveness of the Anchorage I/M Program
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English
Abstract
The Municipality of Anchorage. Alaska has an emissions inspection and maintenance (I/M) program. The program was designed to reduce carbon monoxide (CO). During the first year of operation I/M repairs reduced the fleetwide idle CO emissions by 48.7% and the 2500 RPM CO emissions by 41%.
Since the start up of the program there has been a reduction in ambient CO concentrations and a sharp reduction in the number of days the federal CO standard has been exceeded. Much of this may be due to milder winter temperatures observed since I/M began. To determine if the ambient reduction is due solely to weather, a multiple regression analysis was developed. The analysis shows that the ambient CO reduction achieved in Anchorage can not be attributed solely to weather conditions. A review of data concerning average vehicle miles traveled per day, population changes, and CO control strategies indicates that the main factors causing the non-weather related CO reductions are the federal new car CO standards and the I/M program.
Authors
Citation
Carroll, L., "Effectiveness of the Anchorage I/M Program," SAE Technical Paper 871102, 1987, https://doi.org/10.4271/871102.Also In
References
- U.S. Environmental Protection Agency Region X 1984 Anchorage Air Pollution Control Agency
- Anchorage Air Pollution Control Agency 1983 Carbon Monoxide Emissions Inventory 1984
- U.S. Dept. of Commerce Local Climatological Data. Annual Summary with Comparative Data 1982 Anchorage Alaska 1982
- Alaska Department of Environmental Conservation Low Temperature Automotive Emission Study I 1983
- Anchorage Vehicle Inspection and Maintenance Program First Annual Report 1986
- Dittman Research Corporation of Alaska Vehicle Inspection & Maintenance Program Awareness Study 1985
- Anchorage Air Pollution Control Agency Determination of “Weather Normalized” Carbon Monoxide Trends in Anchorage 1987
- Sierra Research Inc. Assessment of Anchorage's Reasonable Further Progress Toward Attainment of NAAQS for CO for 1986 1987