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Title: Evaluation of Arizona's enhanced I/M program

Abstract

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.

Authors:
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
Environmental Protection Agency (US)
OSTI Identifier:
790859
Report Number(s):
LBNL-44156
R&D Project: 438601; TRN: US200203%%15
DOE Contract Number:
AC03-76SF00098
Resource Type:
Conference
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
Subject:
54 ENVIRONMENTAL SCIENCES; 29 ENERGY PLANNING, POLICY AND ECONOMY; ARIZONA; VEHICLES; EXHAUST GASES; CARBON MONOXIDE; HYDROCARBONS; NITROGEN OXIDES; POLLUTION CONTROL EQUIPMENT; PERFORMANCE TESTING; PROGRAM MANAGEMENT

Citation Formats

Wenzel, Tom. Evaluation of Arizona's enhanced I/M program. United States: N. p., 1999. Web.
Wenzel, Tom. Evaluation of Arizona's enhanced I/M program. United States.
Wenzel, Tom. Wed . "Evaluation of Arizona's enhanced I/M program". United States. doi:. https://www.osti.gov/servlets/purl/790859.
@article{osti_790859,
title = {Evaluation of Arizona's enhanced I/M program},
author = {Wenzel, Tom},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Apr 21 00:00:00 EDT 1999},
month = {Wed Apr 21 00:00:00 EDT 1999}
}

Conference:
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  • Many parts of the country have been in violation of the carbon monoxide and ozone National Ambient Air Quality Standards. Because of these violations, vehicle inspection and maintenance (I/M) programs have been implanted throughout the country. A method and procedure of evaluating the benefits of an I/M program as compared to the projected benefits designated in the MOBILE3 Emission Factor model has been developed. The method includes a detailed analysis of the individual operating parameters of an I/M program, such as the vehicle population, waiver procedures, and manual vs. automated analyzers.
  • The report provides EPA's evaluation of a four-mode, steady-state test utilizing two acceleration simulation modes. This evaluation was designed for determining whether the test is a suitable alternative to the IM 240 for enhanced Inspection and Maintenance programs. The report includes a description of the analysis techniques used, the data used in the evaluation, and a description of the test program.
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