Motor Vehicle Emissions Variability

Publication Date

7-1996

Document Type

Article

Organizational Units

College of Natural Science and Mathematics, Chemistry and Biochemistry

Keywords

Atmospheric chemistry, Emissions, Pollutants

Abstract

Test-to-test variability has been observed by many current testing methods, including the Federal Test Procedure, the IM240 dynamometer test, the idle test common to many Inspection and Maintenance programs, and on-road remote sensing. The variability is attributable to the vehicle, not to the testing procedure. Because the vehicles are the dominant source of variability, the only way such vehicles can be reliably identified is through the use of multiple tests. The emissions variability increases with increasing average emissions, and it appears to be prevalent among the few newer technology vehicles with defective, but untampered, closed-loop emissions control systems (1981 and newer models). In one fleet the variable emitters constitute 2.2% to 4.8% of the vehicles and contribute 8.5% to 22% of the total carbon monoxide emissions. Scheduled I/M programs that fail to ensure repair of these vehicles allow a significant portion of vehicles with excess emissions to escape reduction measures.

Copyright Statement / License for Reuse

All Rights Reserved
All Rights Reserved.

Copyright Date

7-1-1996

Rights Holder

Air & Waste Management Association

Provenance

Received from author

Language

English (eng)

Extent

9 pgs

Publication Statement

Copyright held by the Air & Waste Management Association. User is responsible for all copyright compliance.

Publication Title

Journal of the Air & Waste Management Association

Volume

46

Issue

7

First Page

667

Last Page

675

ISSN

2162-2906

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