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EPA/AR RIN: 2060-AK76 Publication ID: Fall 2003 
Title: Emissions Durability Procedures for New Light-Duty Vehicles and Light-Duty Trucks 
Abstract: On October 22, 2002 the U. S. Court of Appeals for the D.C. Circuit vacated durability provisions that automotive manufacturers used to demonstrate that the emissions of their vehicles would comply with emission standards for the useful lives of those vehicles. The Court also required EPA to issue new regulations. This action fulfills the mandate. The new durability regulations will include options that a manufacturer may choose from to age preproduction vehicles to determine the rate of emission deterioration over the vehicle's useful life. The options will include a prescribed fixed driving cycle and a presribed bench aging cycle that are used to age prototype vehicles or emission control components to the equivalent of the useful life period of the vehicle in a manner that replicates the aging that the vehicle or components would see in actual use. This rule does not change the Federal emission standards or the test procedures used to quantify emissions. 
Agency: Environmental Protection Agency(EPA)  Priority: Substantive, Nonsignificant 
RIN Status: Previously published in the Unified Agenda Agenda Stage of Rulemaking: Proposed Rule Stage 
Major: No  Unfunded Mandates: No 
CFR Citation: 40 CFR 86   
Legal Authority: 42 USC 7521   
Legal Deadline:  None
Timetable:
Action Date FR Cite
NPRM  12/00/2003    
Additional Information: SAN 4757.
Regulatory Flexibility Analysis Required: No  Government Levels Affected: None 
Small Entities Affected: No  Federalism: No 
Included in the Regulatory Plan: No 
Sectors Affected: 3361 Motor Vehicle Manufacturing 
Agency Contact:
Eldert Bontekoe
Environmental Protection Agency
Air and Radiation
1200 Pennsylvania Ave,
Ann Arbor, MI 48105
Phone:734 214-4442
Fax:734 214-4053
Email: Bontekoe.Eldert@epamail.epa.gov

Linda Hormes
Environmental Protection Agency
Air and Radiation
Ann Arbor, MI 48105
Phone:734 214-4502
Fax:734 214-4053
Email: hormes.linda@epamail.epa.gov