Analysis Of Gross Polluter Cutpoints Based On
In-use Vehicle Inspection And Maintenance Test
Data In California
Author(s)
K. Shafizadeh & D.A. Niemeier
Abstract
Emission cutpoints are used to classify vehicles as \“gross polluters” in inspection
and maintenance (I/M) testing in the United States. In this study, we use recent
data from California I/M tests to examine how sensitive populations of \“gross
polluters” change as cutpoints are modified. Using statistical analyses of
emissions test data, we identify a variety of scenarios that have the potential for
efficiently removing a significant portion of the exhibited emissions while
minimizing the number of vehicles that are classified as \“gross polluters” and
required to undergo costly repairs. For each scenario, we compute the resulting
vehicle populations and impact on emissions. The conclusions of the research
provide support for previous findings that suggests tha
Keywords
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