OAR Policy and Guidance Metarecord

Document Title/Subject: Deterioration Factors for Nonroad Diesel Engines Related Documents:	Signed by: Robert Montgomery Signature Date: Contact: Gregory Orehowsky orehowsky.gregory@epa.gov	Filename(s): http://www.epa.gov/ttn/oarpg/t2/memoranda/dfletter7.pdf URL(s):
Regulatory Authority: Title 2	Division/Director: Certification and Compliance Division (OTAQ) /	Submitted By: orehowsky.gregory	OGC Contact: Paul Cort OGC Phone#: 202-564-5573	Internet Contact: Jeff Clark
Document Type: Policy & Guidance Memos,	EPA Document Number: Federal Register:	Supersedes:
Subject Category: AIR CO ENVIRONMENTAL PROTECTION AGENCY NOx PM	Keywords: Carbon monoxide Engines Nitrogen oxides Particulate matter Deterioration Factors nonroad offroad	Terms: Automobiles and other vehicles Test methods
Abstract: This document provides guidance for the determination of deterioration factors (DFs) for nonroad diesel engines. Deterioration factors are applied to the emissions results from new engines and account for any increase in emissions over the regulated useful life of the engine.