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Emissions Forum: Updating Mobile Source Inventories

In this project, ENVIRON developed updated on-road and off-road mobile source emissions inventories for 14 Western states for the 2002 base year and for three future years - 2008, 2013, and 2018. ENVIRON prepared detailed county-level emissions inventories separated by all classes of on-road and off-road vehicles and engines. Emissions were estimated for an average weekday for each of the four seasons. The pollutants included in the inventory are VOC, NOX, CO, SO2, PM10, PM2.5, EC/OC, and NH3. To construct these inventories, ENVIRON surveyed state and local air quality planning agencies and also metropolitan planning organizations (MPOs) to obtain the most up-to-date mobile source activity data and control program information. On-road mobile source emissions were estimated with EPA’s MOBILE6.2 model. Emissions for most off-road mobile sources were estimated with EPA’s Draft NONROAD2004 model. Locomotive emissions were estimated based on locomotive fuel consumption; aircraft emissions were based on aircraft landing and takeoffs and FAA EDMS emission factors; and commercial marine emissions were estimated using a variety of activity data sources and EPA emission factors.

In early 2009, ENVIRON prepared updated the 2018 emission inventories to account for regulations that were enacted after the emission inventories provided below were completed. These updates included new federal controls for locomotives, and new California regulations for on-road diesel trucks and off-road diesel engines. In addition, the California Air Resources Board provided updated 2018 projections for commercial marine emissions activity and controls, and ENVIRON developed updated 2018 West Coast commercial marine emission inventories. During this time EPA also promulgated new emissions standards for small spark-ignition (SI) engines and marine SI engines, enacted a minor change to the snowmobiles emissions standards rule, and released an updated version of the NONROAD model. However, given the very small effect the NONROAD model updates and rule changes are likely to have on the overall emission inventory, and the resources that would be required to exercise the model to revise all NONROAD equipment emissions in all WRAP states for all seasons, the NONROAD equipment emissions inventories for 2018 were not updated.

For more information, contact Tom Moore (WGA) or Alison Pollack (ENVIRON).

Final Documents

2009 Updates

  • Update of California 2018 on-road and non-road emission inventories PDF
  • Update of 2018 locomotive emissions PDF
  • Update of 2018 commercial marine emissions and review of commercial marine regulatory activity PDF
  • Review of recent Federal nonroad equipment controls and NONROAD model updates PDF

Final Report: WRAP Mobile Source Emission Inventories Update
This report describes the methods used to estimate all on-road and off-road mobile source emissions for the WRAP region for the 2002 base year, and projections to 2008, 2013, and 2018. Emissions from marine shipping and road dust are also included. To construct these inventories, ENVIRON surveyed state and local air quality planning agencies to obtain the most up-to-date mobile source activity data and control program information. The inventories include the effects of all "on the books" federal, state, and local mobile source control programs. The report provides a series of graphs and tables of the emissions estimated; more detailed emission inventory information is available in the spreadsheets below. (6/15/06) PDF (3.5 MB)

Project Summary Tables and Graphs

  • 2002 On-road emissions by state XLS
  • 2008 On-road emissions by state XLS
  • 2013 On-road emissions by state XLS
  • 2018 On-road emissions by state XLS
     
  • 2002 Nonroad emissions by state XLS
  • 2008 Nonroad emissions by state XLS
  • 2013 Nonroad emissions by state XLS
  • 2018 Nonroad emissions by state XLS
     
  • Plots and data tables of on-road and nonroad (excluding commercial marine) emissions by state (2002, 2008, 2013, and 2018) XLS
  • 2002 and 2018 locomotive emissions by state XLS
  • West coast emissions summary file, including commercial marine (2002, 2008, 2013, 2018) XLS

2002 Base Year Emissions

  • On-road emissions by state, county, season, category (light-duty/heavy-duty), and fuel type:
    • Alaska XLS (2.2 MB)
    • Arizona XLS (1.3 MB)
    • Colorado XLS (5.1 MB)
    • Idaho XLS (3.6 MB)
    • Montana XLS (4.5 MB)
    • Nevada XLS (1.4 MB)
    • New Mexico XLS (2.7 MB)
      • New Mexico Errata Sheet (11/07/08) PDF
    • North Dakota XLS (4.3 MB)
    • Oregon XLS (2.9 MB)
    • South Dakota XLS (5.3 MB)
    • Utah XLS (2.4 MB)
    • Washington XLS (3.2 MB)
    • Wyoming XLS (2 MB)
  • 2002 Vehicle miles traveled (VMT), all states ZIP (3.2 MB)
     
  • Nonroad emissions by state, county, season, source category, and fuel type:
    • Alaska XLS (7 MB)
    • Arizona XLS (3.9 MB)
    • Colorado XLS (14.8 MB)
    • Idaho XLS (10.5 MB)
    • Montana XLS (13.4 MB)
    • Nevada XLS (4.4 MB)
    • New Mexico XLS (8 MB)
    • North Dakota XLS (12.6 MB)
    • Oregon XLS (9.3 MB)
    • South Dakota XLS (15.5 MB)
    • Utah XLS (7.1 MB)
    • Washington XLS (10 MB)
    • Wyoming XLS (5.8 MB)

2018 Future Year Emissions

  • On-road emissions by state, county, season, category (light-duty/heavy-duty), and fuel type
    • Alaska XLS (2.2 MB)
    • Arizona XLS (1.3 MB)
    • Colorado XLS (5.1 MB)
    • Idaho XLS (3.6 MB)
    • Montana XLS (4.5 MB)
    • Nevada XLS (1.4 MB)
    • New Mexico XLS (2.7 MB)
      • New Mexico Errata Sheet (11/07/08) PDF
    • North Dakota XLS (4.3 MB)
    • Oregon XLS (2.9 MB)
    • South Dakota XLS (5.3 MB)
    • Utah XLS (2.4 MB)
    • Washington XLS (3.2 MB)
    • Wyoming XLS (2 MB)
  • 2018 Vehicle miles traveled (VMT), all states ZIP (3.1 MB)
     
  • Nonroad emissions by state, county, season, source category, and fuel type (XLS in compressed ZIP file): 
    • Alaska XLS (6.7 MB)
    • Arizona XLS (3.9 MB)
    • Colorado XLS (14.9 MB)
    • Idaho XLS (10.5 MB)
    • Montana XLS (13.5 MB)
    • Nevada XLS (4.5 MB)
    • New Mexico XLS (8 MB)
    • North Dakota XLS (12.6 MB)
    • Oregon XLS (8.7 MB)
    • South Dakota XLS (15.5 MB)
    • Utah XLS (7.1 MB)
    • Washington XLS (9.5 MB)
    • Wyoming XLS (5.8 MB)

Road Dust Emissions

  • 2002 Paved and unpaved road dust emissions totals by state XLS
  • 2018 Paved and unpaved road dust emissions totals by state XLS

SMOKE Files

2002 Base Year Emissions

  • On-road emissions
    • California ZIP (108 KB)
    • Non-California ZIP (9.4 MB)
  • Traditional nonroad equipment emissions
    • California ZIP (188 KB)
    • Non-California (NONROAD model) ZIP (14.4 MB)
  • Aircraft emissions (all states) ZIP (265 KB)
  • Locomotive emissions (all states) ZIP (30 KB)
  • Commercial marine emissions
    • Inshore (AK, OR, WA) ZIP (4 KB)
    • For all other commercial marine emissions (near-port and offshore) gridded files may be requested from the Regional Modeling Center.
  • Paved and unpaved road dust emissions ZIP (46 KB)

2018 Projected Emissions

  • On-road emissions
    • California ZIP (112 kb)
    • Non-California ZIP (8.6 MB)
  • Traditional nonroad equipment emissions
    • California ZIP (186 KB)
    • Non-California (NONROAD model) ZIP (13 MB)
  • Aircraft emissions (all states) ZIP (274 KB)
  • Locomotive emissions (all states) ZIP (31 KB)
  • Commercial marine emissions
    • Inshore (AK, OR, WA) ZIP (4 KB)
    • For all other commercial marine emissions (near-port and offshore) gridded files may be requested from the Regional Modeling Center.
  • Paved and unpaved road dust emissions ZIP (46 KB)

Updated 2018 Projected Emissions

  • California on-road emissions ZIP (150 KB)
  • California nonroad equipment emissions ZIP (170 KB)
  • California locomotive emissions ZIP (7 KB)
  • Non-California locomotive emissions ZIP (29 KB)
 

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