Evaluation of Arizona's enhanced I/M program
MOBILE5 slightly overpredicts initial reductions in CO and HC, and dramatically overpredicts initial reductions in NOx. About one-third of the vehicles that fail initial I/M testing do not complete the I/M program. Only a small portion of these receive a waiver. Initial I/M repair effectiveness as measured by remote sensing is only half of that as measured by IM240. Possible causes are sensitivity to operating mode, and how long after repair emissions are measured. 37% of the vehicles that initially fail and eventually pass in 1995 fail again in 1997. Half of these fail for the same combination of pollutants in both years. Vehicles that never pass the Im240 are still being driven in the I/M area; these vehicles are from all model years.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- Environmental Protection Agency (US)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 790859
- Report Number(s):
- LBNL-44156; R&D Project: 438601; TRN: US200203%%15
- Resource Relation:
- Conference: Ninth Coordinating Research Council On-Road Vehicle Emissions Workshop, San Diego, CA (US), 04/19/1999--04/21/1999; Other Information: PBD: 21 Apr 1999
- Country of Publication:
- United States
- Language:
- English
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