I/M Effectiveness as Directly Measured by Ambient CO Data

Paper #:
  • 940302

Published:
  • 1994-03-01
Citation:
Scherrer, H. and Kittelson, D., "I/M Effectiveness as Directly Measured by Ambient CO Data," SAE Technical Paper 940302, 1994, https://doi.org/10.4271/940302.
Pages:
9
Abstract:
The effectiveness of a centralized Inspection/Maintenance (I/M) program, implemented in a major U.S. metropolitan area in 1991, is directly measured through ambient CO monitor data. A multi-factoral analysis is developed which quantifies effects due to the interaction of hourly traffic levels with wind vector and ambient temperature conditions, allowing a better measure of I/M effectiveness. The time-trend of the measured CO levels is seen to closely match those predicted by the analysis throughout the 7 year study period. An average ambient CO reduction of 1.3 ± 1.4 percent attributable to I/M is measured, with individual results of +1.5 percent, +5.8 percent, and -3.4 percent obtained for the three monitor locations studied.
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