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Evaluation Review, Vol. 26, No. 2, 111-146 (2002)
DOI: 10.1177/0193841X02026002001

Evaluating Vehicle Inspection/Maintenance Programs Using On-Road Emissions Data: The Atlanta Reference Method

Leisha DeHart-Davis

Georgia Institute of Technology

Elizabeth Corley

Georgia Institute of Technology

Michael O. Rodgers

Georgia Institute of Technology

On-road remote sensing data is an increasingly popular source of evaluation information forvehicle inspection/maintenance (I/M) programs. This article conducts one such remote sensingdata evaluation for the Atlanta, Georgia, I/M program. The reference method involves comparingemissions differences in I/M and non-I/M fleet vehicles with those predicted by a regulatorycomputer model. Assuming that on-road emissions differences represent observed effectivenessand model-predicted emissions differences represent effectiveness goals, the Atlanta enhancedI/M programappears to be achieving 83% of its targeted emissions reductions. The method comparesfavorably with other remote sensing evaluation methods in its ability to be applied overtime and its relatively small sample size requirement. The chief limitation to the approach is itsreliance on a representative non-I/M fleet, which may differ in characteristics for which controlsare difficult to locate. Such potential confounding factors include discrepancies in maintenancetrends, socioeconomic conditions, and vehicle quality.

Key Words: vehicle inspection/maintenance programs • mobile source emissions • on-road remote sensing data • air pollution


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