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This web site presents general information about heavy-duty highway
engines, such as trucks and buses, and their emissions. This is
also information regarding EPA's diesel programs, regulations, and
retrofit/rebuild programs.
For further information or assistance regarding this web page,
contact:
ASD Information Line, phone: (734) 214-4636 or email:
asdinfo@epa.gov
What's New...
Proposed Rule (signed June 3, 2004) - Control
of Emissions of Air Pollution from New Motor Vehicles: In-Use
Testing for Heavy-Duty Engines and Vehicles
EPA is proposing a manufacturer-run, in-use emissions testing program
for heavy-duty diesel trucks. Under this ground-breaking program,
engine manufacturers will measure emissions from their diesel engines
in highway applications using portable onboard emission measurement
systems. This proposal advances EPA's clean diesel activities
by helping to ensure that the benefits of more stringent emission
standards are realized under real-world driving conditions.
Index to this Page
About PDF Files
General Information
- "Diesel Exhaust in the United States" (EPA420-F-02-048, September
2002) 835K PDF
(4 pages)
- "What You Should Know About Diesel Exhaust and School Bus
Idling" (EPA420-F-03-021, June 2003) 574K
PDF (2 pages)
- "Emission Standards Reference Guide for Heavy-duty and Nonroad
Engines" (EPA420-F-97-014, September 1997) 145K PDF (16 pages). This document provides
a detailed listing of current and proposed Federal and California
standards for model years 1990 and later.
- "Heavy-duty Engine Emission Standards for Highway Trucks &
Buses" (EPA420-96-006, June 1996) 8K TXT or
15K PDF (3 pages)
- "EPA, California Air Resources Board and Manufacturers of Heavy-duty
Engines Sign 'Statement of Principles'" (EPA420-F-95-010a, July
1995) 6K TXT
- "Emission Control Potential for Heavy-duty Diesel Engines" (EPA420-F-97-015,
May 1997) 10K PDF (2
pages)
- "Motor Vehicles and the 1990 Clean Air Act" (EPA400-F-92-013,
August 1994) 40K PDF (7 pages)
- "Milestones in Auto Emissions Control" (EPA400-F-92-014,
August 1994) 64K PDF (3 pages)
Diesel Programs and Regulations
- Proposed Technical Amendments - Test Procedures for Testing
Highway and Nonroad Engines and Omnibus Technical Amendments
(signed August 16, 2004)
- Fact Sheet: "Proposed Changes to Test Procedures for
Nonroad Engines and Heavy-duty Highway Engines" (EPA420-F-04-046,
August 2004) 104K
PDF (3 pages)
- Federal Register Notice: "Test Procedures for
Testing Highway and Nonroad Engines and Omnibus Technical
Amendments"
- Technical Support Document: "Test Procedures for Highway
and Nonroad Engines and Omnibus Technical Amendments"
(EPA420-D-04-004, August 2004) 808K
PDF (70 pages)
- Proposed Rule - Draft Version of revised test procedures
and other technical amendments, due to be proposed July 2004 1.3M
PDF (473 pages)
- Proposed Rule (published June 10, 2004) - Control of
Emissions of Air Pollution from New Motor Vehicles: In-Use
Testing for Heavy-duty Engines and Vehicles
- Fact Sheet (EPA420-F-04-042, June 2004) 117K
PDF (4 pages)
- Federal Register Preamble 180K
PDF (20 pages)
- Federal Register Regulatory Language 140K
PDF (10 pages)
- Draft Technical Support Document: (EPA420-D-04-003,
June 2004) 668K
PDF (55 pages)
- Fact Sheet: Notice of a Settlement with the Engine Manufacturers
Association to propose a manufacturer-run, in-use emissions testing
program for heavy-duty diesel trucks and to provide for EPA engine
certification guidance.
- Fact Sheet (EPA420-F-03-019, June 2003) 114K PDF
(4 pages)
- Final Court Settlement Document 73.5K PDF
(9 pages)
- Attachments to Court Settlement Document
- Heavy-duty Diesel Engine In-Use Testing Program Outline
162K PDF
(10 pages)
- Heavy-duty Engine Certification Q&A; 102K PDF
(9 pages)
- Marine Diesel Engine Q&A; 205K PDF
(10 pages)
- Nonroad Diesel Engine Elements of Settlement 54K PDF
(1 page)
- Final Rule (signed August 1, 2002)
- Nonconformance Penalties for 2004 and later Model Year Emission
Standards for Heavy-duty Diesel Engines and Heavy-duty Diesel
Vehicles
- "Nonconformance Penalties for Heavy-duty Diesel Engines"
(EPA420-F-02-025, August 2002) 14K
PDF (4 pages)
- Preamble and Regulatory text 154K
WPD or 76K PDF (32 pages)
- Technical Support Document: Nonconformance Penalties for
2004 Highway Heavy Duty Diesel Engines (EPA420-R-02-021) 471K WPD or 193K
PDF (61 pages)
- Response to Comments for the Nonconformance Penalty Rulemaking
(EPA420-R-02-020) 188K
WPD or 127K PDF
(29 pages)
- Press
release (8/1/02)
- Proposed Rule (signed January 10,
2002; published January 16, 2002) - Proposed Nonconformance Penalties
for 2004 and later Model Year Emission Standards for Heavy-duty
Diesel Engines and Heavy-duty Diesel Vehicles
The Technical Support Document posted on January 11, 2002
contained minor errors in Table 3-7. These were corrected on
January 15, 2002. Downloads prior to January 16, 2002
may not contain the correct version of Table 3-7.
The proposed rule as published contained the incorrect
number for the EPA Air Docket for this rule. The correct docket
number is A-2001-25. A correction will be published in the Federal
Register.
- Fact Sheet: "Nonconformance Penalties for Heavy-duty
Diesel Engines" (EPA420-F-01-034, December 2001) 13K PDF (4 pages)
- Preamble and Regulatory text (67 FR 2159, January 16, 2002)
99K TXT or 144K PDF (17 pages)
- Draft Technical Support Document: "Nonconformance Penalties
for 2004 Highway Heavy Duty Diesel Engines" (EPA420-D-02-001,
January 2002) 448K WPD or 182K PDF (58 pages)
- Corrections to Tables in the Draft Technical Support Document
for the Nonconformance Penalty Rulemaking 29K
PDF (3 pages)
- Final Rule (published October 6, 2000) - Control of Emissions
of Air Pollution from 2004 and Later Model Year Heavy-duty Highway
Engines and Vehicles
- Fact Sheet: "Final Emission Standards for 2004 and Later
Model Year Highway Heavy-duty Vehicles and Engines" (EPA420-F-00-026,
July 2000) 12K
PDF (4 pages)
- Federal Register (preamble and regulatory text) TXT or PDF
- Regulatory Impact Analysis (EPA420-R-00-010, July 2000)
575K PDF
(157 pages)
- Response to Comments (EPA420-R-00-011, July 2000)
650K WPD
or 460K PDF
(152 pages)
- Cleaner Trucks, Buses, and Diesel Fuel: Control of Air
Pollution from New Motor Vehicles: Proposed Heavy-duty Engine
and Vehicle Standards and Highway Diesel Fuel Sulfur Control Requirements
"2007 Rule"
- October 1999 Proposed Rule - Control of Emissions of Air
Pollution from 2004 and Later Model Year Heavy-duty Highway Engines
and Vehicles; Revision of Light-duty Truck Definition
- Extension of Comment Period: EPA extended the comment
period to December 16, 1999 for all issues except for the
proposal to revise the light-duty truck definition.
Comments related to this issue, contained in the proposed
rule Supplementary Information, Section IV.F, and in the proposed
regulations at 86.1803-04, were accepted through December
2, 1999.
- Public Hearing Transcript 316K
PDF (241 pages)
- Press Release HTML
- Fact Sheet: "Proposed Strategy to Reduce Emissions
from Heavy Duty Vehicles" (EPA420-F-99-034, October
1999) 17K PDF
(4 pages)
- Preamble and Regulations 286K
ZIP WPD or 936K
PDF (434 pages)
- Regulatory Impact Analysis 403K ZIP
WPD or 777K PDF
(145 pages)
- February 1999 Guidance Document to States: "Smoke
Opacity Cutpoints to be Used With the SAE J1667 In-Use Smoke Test
Procedure" (EPA420-F-99-024) 61K
WPD or 125K PDF
(2 pages)
- SAE Report Reference, November 1998 500K
PDF (51 pages)
- "Guidance to States on In-Use Smoke Test Procedures"
(EPA420-F-97-053, April 1997) 57K
WPD or 106K PDF
(2 pages)
- October 1997 Final Rule - New Emission Standards for Heavy-duty
Diesel Engines Used in Trucks and Buses
- Federal Register (Preamble and Regulatory Language) 261K
TXT or 344K
PDF
(38 pages)
- Fact Sheet (EPA 420-F-97-016, October 1997) 8K
WP5 or 14K
PDF (4 pages)
- Preamble and Regulation Language 93K
WP5
- Summary and Analysis of Comments 720K
WP5 or 245K
PDF (79 pages)
- Regulatory Impact Analysis 84K
WP5 or 502K
PDF (143 pages)
- Regulatory Impact Analysis Figures Chapters 2,5,6
10K WP5 or
61K PDF (9 pages)
Chapter 3 900K
WP5 or 698K
PDF (5 pages) and 630K
PDF (4 pages)
- "Estimated Economic Impact of New Emission Standards for
Heavy-duty On-Highway Engines" (EPA420-R-97-009, March 1997)
413K WPD or
255K PDF
(87 pages)
- September 5, 1997 Rule Amending the Test Procedures for Heavy-duty
Engines, and Light-Duty Vehicles and Trucks and the Amending of
Emission Standard Provisions for Gaseous Fueled Vehicles and Engines:
- Direct Final Rule 157K
TXT
- Notice of Proposed Rulemaking (NPRM) 7K
TXT
- February 23, 1996 Heavy-duty Nonconformance Penalties:
- LDT3 Particulate Matter, Final Rule 36K
TXT
- HD Engine/Bus/LDT3 NOx/Particulate Matter, Direct Final
Rule 33K
TXT
Archived Regulatory Information:
- December 1995 HD Engine Highway Test Procedure Proposed
Clarifications 52K ZIP WPD
- December 1995 General Info on HD Engine Technical Amendments
2K TXT
- October 1995 Reopening of Public Comment Period for ANPRM
TXT
- August 1995 Control of Air Pollution From Heavy-duty
Engines, ANPRM TXT or
268K PDF
(26 pages)
- August 1995 Evaporative and Refueling Emission Regulations
for Gasoline- and Methanol-Fueled Light-Duty Vehicles and Light-Duty
Trucks and Heavy-duty Vehicles; Technical Amendments, Final Rule
TXT
or 240K PDF
(29 pages)
- August 1995 Notice of Agency Completion of Study Regarding
Heavy-duty Engine Rebuilding Practices and Availability of Documents
TXT
Urban Bus Retrofit/Rebuild Notices:
- Voluntary Retrofit Program: Use of Urban Bus Program
Retrofit/Rebuild Equipment and Third Party Verification System
and Model State Policies for the Retrofit/Rebuild of Heavy-duty
Diesel Engines (EPA420-R-99-014, June 1999 ) 680K
PDF (97 pages)
- March 26, 1998 Federal Register: Page 14626-14637
Additional Update of Post-Rebuild Emission Levels in 1998 HTML
or 148K PDF (12 pages)
- March 26, 1998 Federal Register: Page 14705
Agency Information HTML
- March 20, 1998 Federal Register: Page 13662-13664
Public Review of a Notification of Intent to Certify Equipment
(DDC) HTML
or 32K PDF (3 pages)
- March 20, 1998 Federal Register: Page 13660-13662
Approval of an Application for Certification of Equipment (Engelhard)
HTML
or 28K PDF (3 pages)
- November 26, 1997 Notice of Agency Certification of Equipment
for the Urban Bus Retrofit/Rebuild Program, Nelson Industries
HTML
or 29K PDF (3 pages)
- November 6, 1997 Notice of EPA certification of equipment
provided by Johnson Matthey Incorporated HTML
- Fact Sheet Concerning EPA's Certification of Engelhard Equipment
to the 0.10 g/bhp-hr standard
- (EPA420-F-97-011, March 1997) 10K PDF
(3 pages)
- November 6, 1997 Public Review of a Notification of Intent
to Certify Equipment; Detroit Diesel Corporation (DDC)
HTML
- July 11, 1997 Federal Register Notices - Retrofit/Rebuild
Requirements for 1993 and Earlier Model Year Urban Buses; Public
Review of a Notification of Intent to Certify Equipment (Nelson
Industries, Inc.) HTML
- June 16, 1997 Public Review of a Notification of Intent
to Certify Equipment
- Engelhard 17K HTML
- Engine Control Systems (ECS) with Public Review of a Request
To Amend a Current Certification 22K HTML
- Engelhard Retrofit/Rebuild Kit certified for Detroit Diesel
Engines
- February 28, 1997 Press Release HTML
- March 14, 1997 Federal Register Notice 98K TXT
- Fact Sheet Concerning EPA's Certification of Johnson Matthey
Equipment to the 0.10 g/bhp-hr standard (EPA 420-F-97-038,
October 1997) 11K PDF
(3 pages)
- January 30, 1997 Public Review of a Notification of Intent
to Certify Equipment; Johnson Matthey Incorporated (JMI) 23K
TXT
- January 6, 1997 Notice of Certification of Equipment
Supplied by Engine Control Systems, Ltd.
HTML
or 44K PDF (5 pages)
Archived Urban Bus Information:
- November 1996 Update of Post-Rebuild Emission Levels
in 1997, 42K
TXT
- October 1996 Notice of Certification of Equipment Supplied
by Twin Rivers Technologies. 65K
TXT
- August 1996 Status of Equipment Certified and Emissions
Levels To Be Used by Operators Using Compliance Option 2: 22K
TXT, garbled table or
36K PDF (5 pages)
- August, 1996 Public Review of a Notification of Intent
to Certify Equipment, Engine Control Systems, Ltd. 17K
TXT
- May 1996 Public review of Engelhard intent to certify
15K
TXT
- April 1996 Approval of Johnson-Matthey intent to certify
51K
TXT
- April 1996 Public review of DDC intent to certify
14K
TXT
- March 1996 Notice of Receipt of Detroit Diesel Corporation
Certification Cost Info 23K TXT
- October 1995 Approval of a Notification of Intent To Certify
Equipment for the Urban Bus Retrofit/Rebuild Program; Detroit
Diesel Corporation (DDC) 18K TXT
Phone numbers (Contacts List
by Topic)
Links to Related EPA Pages:
Links to Related Non-EPA Pages: 
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