On-road evaluation of inspection/maintenance effectiveness

Article Abstract:

Previous inspection and maintenance (I/M) programs at a number of monitored sites have fallen short of the EPA's expectations in terms of their effect on motor vehicle carbon monoxide and hydrocarbon exhaust emissions measured on-road using remote sensing. No significant difference was observed in emissions from I/M and non-I/M vehicles in Tucson, AZ, and in rural Colorado, while an I/M effect in El Paso, TX, fell short of projections. CO emissions by vehicle age at the same locations in Chicago, IL, and Denver, CO, show no difference.

Waste gases, Air quality

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On-road evaluation of an automobile emission test program

Article Abstract:

Colorado's IM240 automobile emission test program exhibits a statistically significant 4% to 7% benefit for CO and undetectable benefits for HC and NO, using even model years as a control. On-road remote sensing exhaust measurements were conducted over five days in winter 1995-1996 to assess the marginal benefit of the inspection and maintenance program. Odd model year cars outside the program showed higher average CO emissions than their even model counterparts.

Administration of Air and Water Resource and Solid Waste Management Programs, Emissions NEC, Automobiles, Environmental policy, Colorado, Emissions (Pollution)

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On-road vehicle emissions: regulations, costs, and benefits

Article Abstract:

EPA vehicle-emission policy based on a model that correlates emission toxicity directly with the age of a car is counterproductive. An emissions sampling in Los Angeles indicated that policies targeted toward poorly maintained and illegally altered vehicles would be more cost-effective.

Standards, Planning, Motor vehicles, United States. Environmental Protection Agency

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