Although NONROAD is now incorporated into the MOtor Vehicle Emission Simulator (MOVES) model, these technical reports still apply to its inputs and algorithms. The reports are listed by NONROAD version.

• NONROAD2008a
• NONROAD2005
• Draft NONROAD2004
• Draft NONROAD2002a and Earlier
• Prior Versions

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NONROAD2008a Technical Reports

These reports were updated in either July 2010, December 2005 or April 2004 and supersede prior versions. They are updated for NONROAD2008a.

See Frequently Asked Questions About NONROAD2008 (PDF)  (5 pp, 190K, EPA420-F-09-021, April 2009) for additional information.

• Temperature Corrections for Nonroad Exhaust Emissions, NR-001c (PDF) (4 pp, 33K, EPA420-R-05-014, December 2005)
• Conversion Factors for Hydrocarbon Emission Components, NR-002d (PDF) (6 pp, 488K, EPA-420-R-10-015, July 2010)
• Exhaust Emission Effects of Fuel Sulfur and Oxygen on Gasoline Nonroad Engines, NR-003c (PDF) (8 pp, 111K, EPA420-R-05-016, December 2005)
• Seasonal and Monthly Activity Allocation Fractions for Nonroad Engine Emissions Modeling, NR-004c (PDF) (22 pp, 723K, EPA420-R-05-017, December 2005)
• Median Life, Annual Activity, and Load Factor Values for Nonroad engine Emissions Modeling, NR-005d (PDF) (47 pp 874K, EPA-420-R-10-016, July 2010)
• Nonroad Engine Population Estimates, NR-006e (PDF) (48 pp, 1.1MB, EPA-420-R-10-017, July 2010)
• Calculation of Age Distributions in the Nonroad Model -- Growth and Scrappage, NR-007c (PDF) (16 pp, 141K, EPA420-R-05-018, December 2005)
• Nonroad Engine Growth Estimates, NR-008c (PDF) (PDF, 13 pp, 208K, EPA-420-P-04-008, April 2004)
• Exhaust and Crankcase Emission Factors for Nonroad Engine Modeling --Compression-Ignition, NR-009d (PDF) (141 pp, 2.3MB, EPA-420-R-10-018, July 2010)
• Exhaust Emission Factors for Nonroad Engine Modeling -- Spark-Ignition, NR-010f (PDF) (58 pp, 1.1MB, EPA-420-R-10-019, July 2010)
• Nonroad Spark-Ignition Engine Emission Deterioration Factors, NR-011d (PDF) (17 pp, 616K, EPA-420-R-10-020, July2010)
• Nonroad Evaporative Emission Rates, NR-012d (PDF) (147 pp, 2.7MB, EPA-420-R-10-021, July 2010)
• Refueling Emissions for Nonroad Engine Modeling, NR-013b (PDF) (8 pp, 151K, EPA420-P-04-013, April 2004)
• Geographic Allocation of Nonroad Engine Population Data to the State and County Level, NR-014d (PDF) (29 pp, 226K, EPA420-R-05-021, December 2005)
• Weekday and Weekend Day Temporal Allocation of Activity In The NONROAD Model, NR-015a (PDF) (7 pp, 154K, EPA420-P-04-015, April 2004)

NONROAD2005

• Temperature Corrections for Nonroad Exhaust Emissions, NR-001c (PDF) (4 pp, 33K, EPA420-R-05-014, December 2005)
• Conversion Factors for Hydrocarbon Emission Components, NR-002c (PDF) (6 pp, 55K, EPA420-R-05-015, December 2005)
• Exhaust Emission Effects of Fuel Sulfur and Oxygen on Gasoline Nonroad Engines, NR-003c (PDF) (8 pp, 111K, EPA420-R-05-016, December 2005)
• Seasonal and Monthly Activity Allocation Fractions for Nonroad Engine Emissions Modeling, NR-004c (PDF) (22 pp, 723K, EPA420-R-05-017, December 2005)
• Median Life, Annual Activity, and Load Factor Values for Nonroad engine Emissions Modeling, NR-005c (PDF) (46 pp 518K, EPA420-P-04-005, April 2004)
• Nonroad Engine Population Estimates, NR-006d (PDF) (46 pp, 1.1MB, EPA420-P-05-022, December 2005)
• Calculation of Age Distributions in the Nonroad Model -- Growth and Scrappage, NR-007c (PDF) (16 pp, 141K, EPA420-R-05-018, December 2005)
• Nonroad Engine Growth Estimates, NR-008c (PDF) (PDF, 13 pp, 208K, EPA420-P-04-008, April 2004)
• Exhaust and Crankcase Emission Factors for Nonroad Engine Modeling --Compression-Ignition, NR-009c (PDF) (135 pp, 599K, EPA420-P-04-009, April 2004)
• Exhaust Emission Factors for Nonroad Engine Modeling -- Spark-Ignition, NR-010e (PDF) (50 pp, 1.1MB, EPA420-R-05-019, December 2005)
• Nonroad Spark-Ignition Engine Emission Deterioration Factors, NR-011c (PDF) (16 pp, 127K, EPA420-R-05-023, December 2005)
• Nonroad Evaporative Emission Rates, NR-012c (PDF) (117 pp, 2.5MB, EPA420-R-05-020, December 2005)
• Refueling Emissions for Nonroad Engine Modeling, NR-013b (PDF) (8 pp, 151K, EPA420-P-04-013, April 2004)
• Geographic Allocation of Nonroad Engine Population Data to the State and County Level, NR-014d (PDF) (29 pp, 226K, EPA420-R-05-021, December 2005)
• Weekday and Weekend Day Temporal Allocation of Activity In The NONROAD Model, NR-015a (PDF) (7 pp, 154K, EPA420-P-04-015, April 2004) 

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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)

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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)

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Prior Versions of Technical Reports

Prior Versions of Technical Reports (ZIP)(38 pp, 3 MB)

• RVP and Temperature Corrections, NR-001 (posted November 13, 1997) - available as .txt and .pdf
• HC Conversion Factors: VOC/TOG/ROG/etc, NR-002 (PDF)
• Exhaust Emission Effects of Fuel Sulfur and Oxygen on Gasoline Nonroad Engines, NR-003 (PDF)
• Seasonal and Monthly Activity Allocation Fractions, NR-004 (PDF)
• Average Life, Annual Activity, and Load Factor Values, NR-005a (PDF)
• Nonroad Engine Population Estimates, NR-006a (PDF)
• Calculation of Age Distributions -- Growth and Scrappage, NR-007 (PDF)
• Nonroad Engine Growth Estimates, NR-008 (PDF)
• Exhaust Emission Factors -- Compression-Ignition, NR-009a (PDF)
• Exhaust Emission Factors -- Spark-Ignition, NR-010b (PDF)
• 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
  • tech1.wk4
  • techmix.wk4
• Emission Deterioration Factors For the NONROAD Emissions Model, NR-011 (PDF)
• Basic Evaporative and Crankcase Emission Rates, NR-012 (PDF)
• Refueling Emissions for Nonroad Engine Modeling, NR-013 (PDF)
• Geographic Allocation of State Level Nonroad Engine Population Data to the County Level, NR-014 (PDF)
• U.S. Maps of county-level indicators for nonroad equipment usage (GIF files):
  • employees in air transportation industry
  • dollar value of construction
  • acres of harvested cropland
  • number of public golf courses
  • number of single & double unit homes
  • number of employees in landscaping & horticultural services
  • number of employees in logging industry
  • number of employees in lumber & wood processing industry
  • number of employees in manufacturing
  • number of employees in metals mining
  • number of employees in coal mining
  • number of employees in oil & gas extraction industry
  • 1997 human population estimates
  • number of employees in RV parks & campsites
  • number of RV park & campsite establishments
  • water surface area
  • number of wholesale establishments
• Weekday and Weekend Day Temporal Allocation of Activity In The NONROAD Model, NR-015 (PDF)

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