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NONROAD Model Archives

This page contains archive files related to the EPA Draft NONROAD Model, such as prior versions of the model and technical documentation. The primary use of these older drafts is for comparative analyses by professional mobile source modelers, such as state air quality officials and consultants. For the latest public version of the model and guidance on what version to use for SIPs see the main NONROAD model web page.

For further information or assistance regarding this web page, contact:
ASD Information Line, phone: (734) 214-4636 or email: asdinfo@epa.gov

• Listserver Information
• Draft NONROAD2004 Model
• June 2003 Draft NONROAD2002a Model
• June 2000 Draft NONROAD Model for 2007 HD Highway Rulemaking
• Prior Versions of Model
• Documentation: User Guide
• Documentation: Technical Reports
• Other EPA NONROAD Model Documentation
• Workshop Information
• Other Nonroad Reference Material
• Other EPA References
• Links to Related Non-EPA Pages

NOTE: You will need Adobe Acrobat Reader, available as a free download, to view some of the files on this page. See EPA's PDF page to learn more about PDF, and for a link to the free Acrobat Reader.

Listserver Information

• Subscription Instructions and Email addresses
• Important Listserver Notices
  • NONROAD Model Status Update, 5/21/1999 (clarifies use of NONROAD for SIP purposes)
  • NONROAD Model Status Update, 6/12/2000 (release of June 2000 Draft in support of 2007 HD highway rule)

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Draft NONROAD2004 Model

• Cautionary Note regarding NIF Output from Draft NONROAD2002a and Draft NONROAD2004 (September 15, 2004)
• Postprocessor Tool (MS-Access) - aggregates NONROAD.OUT files into county SCC (or other) totals.
  • Postprocessor tools for NONROAD2002a and 2004 (ZIP, 776K, for Microsoft Access 97 and Access 2000)
  • Instructions for using NONROAD postprocessor tools
• Frequently Asked Questions (PDF): (106K, EPA420-F-04-033) Draft NONROAD2004 Emission Inventory Model
• ReadMe File
• Update Notes & Installation Instructions - Please read this text file to determine which files to download.
• Diesel Fuel Sulfur Inputs for the Model used in the 2004 Nonroad diesel Engine Final Rule
• NIF 2.0 Output Options for the NONROAD Reporting Utility
• Updated Core Model, Data Files, GUI, and Reporting Utility (ZIP) (7.1MB) If you have never installed the GUI on your current computer, you will also need the GUI install files below.
• Graphical User Interface DLL files (ZIP) (2.6MB) Needed only if you have never installed a NONROAD GUI before. Once you have installed these files once, then you only need to update the GUI executable, nr-gui.exe, as updates become available.
• Fortran Source Code for Core Model (ZIP) (245K)

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June 2003 Draft NONROAD2002a Model

• Guidance on use of NONROAD model for SIP inventories (PDF) (95K)
• Frequently Asked Questions on this release of NONROAD model (PDF) (90K, EPA420-F-03-023)
• ReadMe File
• Update Notes & Installation Instructions - Please read this text file to determine which files to download.
• EPA's Newest Draft Nonroad Emission Inventory Model (PDF) (63K) (April 2003 Emission Inventory Improvement Conference paper, compares draft NONROAD2002 to prior version)
• Updated Core Model, Data Files, GUI, and Reporting Utility (ZIP) (6.3MB) If you have never installed the GUI on your current computer, you will also need the GUI install files below.
• Graphical User Interface DLL files (ZIP) (2.6MB) Needed only if you have never installed a NONROAD GUI before. Once you have installed these files once, then you only need to update the GUI executable, nr-gui.exe, as updates become available.
• Fortran Source Code for Core Model (ZIP) (230K)

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June 2000 Draft NONROAD Model for 2007 HD Highway Rulemaking

EPA does not recommend use of the draft NONROAD model in official SIP submittals. It is expected that emission rates and activity levels predicted by the model will change, possibly substantially, after further data collection and analysis. See the May 1999 announcement for more information on possible changes.

• June 2000 Update Notes & Instructions - Please read this text file to determine which files to download.
• Core Model & Data Files (ZIP) (2MB)
• Reporting Utility, updated subset of files only (ZIP) (275K)
• Reporting Utility, all files (ZIP) (3MB)
• January 2000 Updated Graphical User Interface (GUI)
  • Release Notes
  • GUI executable (ZIP) (70K)
• Graphical User Interface DLL files (ZIP) (2.6MB) Needed only if you have never installed the NONROAD GUI before. Once you have installed these files once, then you only need to update the GUI executable, nr-gui.exe, as updates become available.
• Fortran Source Code (ZIP) (230K)
• May 31, 2000 Memo: Changes to the NONROAD Model for the April 2000 Version Used in Support of the 2007 Heavy-duty Diesel Engine Rule (PDF) (100K)

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Prior Versions of Model

• April 1999 Draft NONROAD Model for Tier 2 Proposed Rule
  • Update Notes & Instructions
  • NONROAD Model Technical Report Addenda, for Tier 2 Rulemaking Version (PDF) (45K, EPA420-R-99-008, posted April 1, 1999)
• June 1998 Draft NONROAD Model
  • October 16, 1998 Model Updates
    • Update Notes & Instructions
  • 7/17/98 Model Updates
    • Update Notes & Instructions

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Documentation: User Guide

• User Guide from Draft NONROAD2002a and Draft NONROAD2004:
  • Main body of document without appendices (PDF) (500K, EPA420-P-02-013, reposted December 12, 2002, with EPA document number)
  • Appendices (PDF) (400K, EPA420-P-02-013, reposted December 12, 2002, with EPA document number)

• Original User Guide from June 1998 draft model release:
  • Title Page (PDF) (12K)
  • Table of Contents (PDF) (33K)
  • Chapter 1 Introduction (PDF) (135K)
  • Chapter 2 Getting Started (PDF) (25K)
  • Chapter 3 Graphical User Interface (PDF) (200K)
  • Chapter 4 Core Model (PDF) (220K)
  • Chapter 5 Reporting Utility (PDF) (190K)
  • Chapter 6 Advanced Topics (PDF) (430K)
  • Chapter 7 Trouble Shooting (PDF) (60K)
  • Appendix A FIPS Codes - excerpt: (PDF) (20K) or full text list
  • Appendix B Source Classification Codes (SCC's) (PDF) (175K)
  • Appendix C Examples of Standard Reports (PDF) (55K)
  • Appendix D Examples of Model Comparison Reports (PDF) (35K)

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Documentation: Technical Reports

Draft NONROAD2004 updates (April 2004) that supersede prior versions:

• RVP and Temperature Corrections for Nonroad Engine Modeling, NR-001b (PDF) (216K, EPA420-P-04-002, April 2004)
• Conversion Factors for Hydrocarbon Emission Components, NR-002b (PDF) (186K, EPA420-P-04-001, April 2004)
• Exhaust Emission Effects of Fuel Sulfur and Oxygen on Gasoline Nonroad Engines, NR-003b (PDF) (207K, EPA420-P-04-003, April 2004)
• Seasonal and Monthly Activity Allocation Fractions for Nonroad Engine Emissions Modeling, NR-004b (PDF) (282K, EPA420-P-04-004, April 2004)
• Median Life, Annual Activity, and Load Factor Values for Nonroad engine Emissions Modeling, NR-005c (PDF) (518K, EPA420-P-004-005, April 2004)
• Nonroad Engine Population Estimates, NR-006c (PDF) (389K, EPA420-P-04-006, April 2004)
• Calculation of Age Distributions in the Nonroad Model - Growth and Scrappage, NR-007b (PDF) (343K, EPA420-P-04-007, April 2004)
• Nonroad Engine Growth Estimates, NR-008c (PDF) (208K, EPA420-P-04-008, April 2004)
• Exhaust and Crankcase Emission Factors for Nonroad Engine Modeling --Compression-Ignition, NR-009c (PDF) (599K, EPA420-P-04-009, April 2004)
• Exhaust Emission Factors for Nonroad Engine Modeling - Spark-Ignition, NR-010d (PDF) (319K, EPA420-P-04-010, April 2004)
• Spark-Ignition Engine Emission Deterioration Factors for the Draft NONROAD2004 Emissions Model, NR-011b (PDF) (220K, EPA420-P-04-011, April 2004)
• Basic Evaporative and Crankcase Emission Rates for Nonroad engine Modeling, NR-012b (PDF) (165K, EPA420-P-04-012, April 2004)
• Refueling Emissions for Nonroad Engine Modeling, NR-013b (PDF) (151K, EPA420-P-04-013, April 2004)
• Geographic Allocation of State Level Nonroad Engine Population Data to the County Level, NR-014c (PDF) (201K, EPA420-P-04-014, April 2004)
• Weekday and Weekend Day Temporal Allocation of Activity In The NONROAD Model, NR-015a (PDF) (154K, EPA420-P-04-015, April 2004)

Technical Reports from Draft NONROAD2002a and earlier:

• RVP and Temperature Corrections, NR-001a (PDF) (37K, EPA420-P-02-011, posted December 11, 2002)
• HC Conversion Factors: VOC/TOG/ROG/etc, NR-002a (PDF) (134K, EPA420-P-03-002, posted June 19, 2003)
• Exhaust Emission Effects of Fuel Sulfur and Oxygen on Gasoline Nonroad Engines, NR-003a (PDF) (28K, EPA420-P-02-012, posted December 11, 2002)
• Seasonal and Monthly Activity Allocation Fractions, NR-004a (PDF) (82K, EPA420-P-02-010, posted December 11, 2002)
• Average Life, Annual Activity, and Load Factor Values, NR-005b (PDF) (205K, EPA420-P-02-014, posted December 16, 2002)
• Nonroad Engine Population Estimates, NR-006b (PDF) (205K, EPA420-P-02-004, posted December 10, 2002)
• Calculation of Age Distributions -- Growth and Scrappage, NR-007a (PDF) (50K, EPA420-P-02-017, posted December 18, 2002)
• Nonroad Engine Growth Estimates, NR-008b (PDF) (40K, EPA420-P-02-018, posted December 18, 2002)
• Exhaust Emission Factors -- Compression-Ignition, NR-009b (PDF) (590K, EPA420-P-02-016, posted December 17, 2002)
• Exhaust Emission Factors -- Spark-Ignition, NR-010c (PDF) (200K, EPA420-P-02-015, posted December 17, 2002)
• Spark-Ignition Engine Emission Deterioration Factors for the Draft NONROAD2002 Emissions Model, NR-011a (PDF) (130K, EPA420-P-02-019, posted December 18, 2002)
• Basic Evaporative and Crankcase Emission Rates, NR-012a (PDF) (36K, EPA420-P-02-002, posted December 10, 2002)
• Refueling Emissions for Nonroad Engine Modeling, NR-013a (PDF) (39K, EPA420-P-02-003, posted December 10, 2002)
• Geographic Allocation of State Level Nonroad Engine Population Data to the County Level, NR-014b (PDF) (93K, EPA420-P-02-009, posted December 11, 2002)
• Weekday and Weekend Day Temporal Allocation of Activity In The NONROAD Model, NR-015 (same as original) (PDF) (30K, EPA420-P-99-033, posted December 11, 2002)

Prior Versions of Technical Reports

• May 31, 2000 Memo: Changes to the NONROAD Model for the April 2000 Version Used in Support of the 2007 Heavy-duty Diesel Engine Rule (PDF) (100K)
  
• NONROAD Model Technical Report Addenda, for Tier 2 Rulemaking Version (PDF) (45K, EPA420-R-99-008, posted May 3, 1999)
  
• RVP and Temperature Corrections, NR-001 (posted November 13, 1997) (Also available as a PDF file, 17K)
• HC Conversion Factors: VOC/TOG/ROG/etc, NR-002 (PDF) (10K, posted November 25, 1997)
  
• Exhaust Emission Effects of Fuel Sulfur and Oxygen on Gasoline Nonroad Engines, NR-003 (PDF) (21K, posted November 25, 1997)
  
• Seasonal and Monthly Activity Allocation Fractions, NR-004 (PDF) (23K, posted December 9, 1997)
• Average Life, Annual Activity, and Load Factor Values, NR-005a (PDF) (45K, revision posted June 19, 1998)
• Nonroad Engine Population Estimates, NR-006a (PDF) (74K, revision posted June 19, 1998)
• Calculation of Age Distributions -- Growth and Scrappage, NR-007 (PDF) (360K, posted February 24, 1998)
• Nonroad Engine Growth Estimates, NR-008 (PDF) (32K, posted March 6, 1998)
• Exhaust Emission Factors -- Compression-Ignition, NR-009a (PDF) (95K, revision posted June 19, 1998)
• Exhaust Emission Factors -- Spark-Ignition, NR-010b (PDF) (180K, EPA420-R-99-009, revision posted May 3, 1999)
• Exhaust Emission Factors -- Spark-Ignition, NR-010a (revision posted June 19, 1998)
  NOTE: See later revision NR-010b above, posted May 3, 1999.
  Attachments: (not revised)
  • compare.xls (1.8MB) (Also available as a ZIP file, 358K)
  • tech1.wk4 (31K)
  • techmix.wk4 (127K)
• Emission Deterioration Factors For the NONROAD Emissions Model, NR-011 (PDF) (90K, posted September 10, 1998)
• Basic Evaporative and Crankcase Emission Rates, NR-012 (PDF) (19K, posted February 13, 1998)
• Refueling Emissions for Nonroad Engine Modeling, NR-013 (PDF) (14K, posted August 26, 1998)
• Geographic Allocation of State Level Nonroad Engine Population Data to the County Level, NR-014 (PDF) (90K, posted September 16, 1998)
• U.S. Maps of county-level indicators for nonroad equipment usage (GIF files):
  • (employees in air transportation industry (80K)
  • dollar value of construction (90K)
  • acres of harvested cropland (90K)
  • number of public golf courses (80K)
  • number of single & double unit homes (90K)
  • number of employees in landscaping & horticultural services (85K)
  • number of employees in logging industry (75K)
  • number of employees in lumber & wood processing industry (80K)
  • number of employees in manufacturing (90K)
  • number of employees in metals mining (70K)
  • number of employees in coal mining (65K)
  • number of employees in oil & gas extraction industry (75K)
  • 1997 human population estimates (35K)
  • number of employees in RV parks & campsites (80K)
  • number of RV park & campsite establishments (90K)
  • water surface area (90K)
  • number of wholesale establishments (90K)
• Weekday and Weekend Day Temporal Allocation of Activity In The NONROAD Model, NR-015 (PDF) (30K, posted May 3, 1999)

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Other EPA NONROAD Model Documentation

• December 1998 AWMA NONROAD Paper & Presentations (Air and Waste Management Association)
  • Full EPA Paper on Growth & Geographic Allocation (PDF) (37K)
  • EPA Presentation on Growth & Geographic Allocation (PDF) (158K)
  • Environ Corp. Presentation on EPA's New NONROAD Mobile Emissions Model (PDF) (268K)
• 1997 EPA Contract No. 68-D3-0035 Work Assignment No. III-107
  • Task 1A report: Evaluation of Power Systems Research (PSR) Nonroad Population Data Base, E.H. Pechan & Associates, Inc. for US EPA, Sept 1997 (PDF) (136K)
  • Task 1B report: Methodologies for Estimating the Population of Nonroad Engines, Energy and Environmental Analysis, Inc. for E.H. Pechan & Associates, Inc. for US EPA, October 1997 (PDF) (73K)
  • Task 2 report: Comparison of Methods for Projecting Nonroad Equipment Activity Levels, E.H. Pechan & Associates, Inc. for US EPA, September 1997 (PDF) (377K)
• October 1997 AWMA Paper (Air and Waste Management Association)
  • Abstract
  • Full Paper (PDF) (46K)
• September 1997 Presentation slides for Early Feedback meeting with EPA Region 5 stakeholders on design of the new NONROAD national emission inventory model (PDF) (480K)

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Workshop Information

• Nonroad Model Workshop #4, November 5, 2002: Ann Arbor: A 3-day modeling workshop was held in Ann Arbor, MI, November 5 through 7, 2002. Only the first day of the workshop (November 5) was devoted to NONROAD model. The second and third days were devoted to the MOVES model and MOBILE6 model, respectively.
  • Workshop Presentations
    
    • Presentations from the 1-day NONROAD Session
      A ZIP (361K) file containing the agenda and all of the presentations in PDF formats
    • Presentations for the 1-day MOVES Session
      A ZIP (1.3MB) file containing the agenda and the presentations in PDF format as well as a transcript of that day's session.
    • Presentations for the 1-day MOBILE6 Session
      The MOBILE6 session consisted of five EPA presentations and a user forum in which three presentations were submitted by individual users.
      A ZIP (1.4MB) file containing the agenda and all five of the EPA presentations in  PDF format
      A ZIP (1.4MB) file containing the agenda and all three of the user submitted presentations in PDF format
  • Workshop Daily Agendas (final version)
    • NONROAD Session (November 5)
    • MOVES Session (November 6)
    • MOBILE6 Session (November 7)
  • Workshop Announcement and Tentative Agenda (PDF) (395K)
• Nonroad Model Workshop #3, June 25, 1998 - Chicago:
  • Workshop Presentation Overheads/Handouts
    • EPA presentations (PDF) (900K) (plans, detailed input data descriptions, etc.)
    • Environ presentation (PDF) (600K) (model calculation methodology)
  • June 3, 1998 Federal Register Notice
  • Updated June 25, 1998, Workshop Announcement (Chicago)
  • Preliminary Agenda for Workshop
• Nonroad Model & MOBILE6 Workshop #2: Nonroad Model presentation, October 2, 1997.
  • Draft Workshop Agenda
  • Workshop Announcement: August 29, 1997 Federal Register Notice
• Nonroad Model & MOBILE6 Workshop #1: 2-day workshop in Ann Arbor, MI, March 19 & 20, 1997
  • March 20, 1997 Presentation of EPA NONROAD Emission Inventory Model Plans (PDF) (65K)
    
  • Nonroad Outline
  • Invitation Letter
  • Draft Fed Register Notice

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Other Nonroad Reference Material

• Analysis of Commercial Marine Vessels Emissions and Fuel Consumption Data (PDF) (2.6MB, EPA420-R-00-002, posted Feb 10, 2000)
• Commercial Marine Activity in the United States - Final Reports (posted Sept 23, 1999)
  • Great Lake and Inland River Ports (PDF) (360K, EPA420-R-99-019)
  • Deep Sea Ports (PDF) (1MB, EPA420-R-99-020)
• Aviation emissions regulations & guidance (aircraft and ground support equipment)
• Voluntary Emission Reduction Program for Airport Ground Support Equipment (GSE Study and GSE Emissions Model)

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Other EPA References

• August 27, 1997 Memo: Emission Inventories Used in the Nonroad Diesel Proposed Rule for Tier 2 and Tier 3 Emission Standards (NPRM published September 24, 1997)
  • Memorandum (21K)
  • Spreadsheet (7K)
• Table of Info Sources for Nonroad Emission Factors (PDF) (9K, updated Feb 1999)
• Emission Inventory Preparation
  • Procedures for Emission Inventory Preparation - Volume IV: Mobile Sources (from National Transportation Library of the US Dept of Transportation) (Also available as a PDF file, 3.1MB, EPA420-92-009, used to be listed as EPA-450/4-81-026d revised)
• AP-42
  • Status of Work to Update AP-42 Nonroad Emission Factors
  • 1996 Statement of Work to Update AP-42 Nonroad Emission Factors (work was never completed)
• November 1991: Nonroad Engine and Vehicle Emission Study Report (Publication no. EPA-21A-2001 or EPA460/3-91-002).
  • README about NEVES including hardcopy ordering information
  • Body of report (PDF) (1.8MB)
  • Appendices (PDF) (7.7MB)

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Links to Related Non-EPA Pages

• CARB Mobile Source Emission Inventory Branch (California Air Resources Board)

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