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Nonroad Mobile Workgroup

Collaborative Wiki Main Page

Inventory Collaborative Google Drive Link


Co-leads: Sarah Roberts (EPA OTAQ), Joseph Jakuta (Ozone Transport Commission),

Alexandra Catena (District of Columbia), Alison Eyth (EPA OAQPS), Andy Bollman (North Carolina), Brian Sullins (Alabama), Brian Timin (EPA OAQPS), Brian Trowbridge (Pennsylvania), Chris Bovee (Wisconsin), Chris Kite (Texas), Chris Rochester (New York), Collin Smythe (Vermont), Dale Wells (Colorado), Gil Grodzinsky (Georgia), James Smith (Tennessee), Jim Koronaides (New Jersey), Ken Santlal (Massachusetts), Marc Bennett (Massachusetts), Mark Janssen (LADCO), Mike Maleski (Ohio), Peter Verschoor (Utah), Rebecca Simpson (Colorado), Sonya Lewis-Cheatham (Virginia), Susanne Cotty (Pima County, AZ), Sylvia Vanderspek (California), Tim Wallace (Maryland), Vanessa Crandell-Beck (Alaska)

Work Group Meetings

FEBRUARY 8, 2018


Co-leads: Sarah Roberts (EPA OTAQ), Joseph Jakuta (Ozone Transport Commission),

Alexandra Catena (District of Columbia), Alison Eyth (EPA OAQPS), Brian Sullins (Alabama), Brian Timin (EPA OAQPS), Brian Trowbridge (Pennsylvania), Chris Bovee (Wisconsin), Chris Kite (Texas), Chris Rochester (New York), Dale Wells (Colorado), Gil Grodzinsky (Georgia), James Smith (Tennessee), Ken Santlal (Massachusetts), Kusandra King (North Carolina), Marc Bennett (Massachusetts), Mark Janssen (LADCO), Mike Maleski (Ohio), Rebecca Simpson (Colorado), Sonya Lewis-Cheatham (Virginia), Stephanie Huber (California), Susanne Cotty (Pima County, AZ), Vanessa Crandell-Beck (Alaska)


  • Welcome and Introductions
  • Overview of Inventory Collaborative
    • Organizational Structure
    • Platform Schedule
    • Resources
  • Nonroad Work Group Tasks
  • Planned Updates to NONROAD Model
  • Next Steps


EPA heard from states that they wanted to be more involved in providing inputs in development of inventories, as well as the methods used, in particular when projecting growth. Inventory will be in 3 phases. Alpha will be based on 2014 NEI v2, which has been posted on the ftp site. The nonroad files are rather large and might need to be resized. Beta will include projections to 2023 and 2028 and improvements to 2011. 2016v will be completed by winter 2019.

NONROAD standalone model was release about 20 years ago and besides folding it into the MOVES GUI and updating a few emissions rates there have been no improvements. EPA is planning on updating the growth rates that are growing populations or activity from 1996, 1998, or 2000 depending on class in the next update to MOVES. It currently uses a national growth rate, which is based on a linear extrapolation. Planning on using a variety of mostly public data sets including projection surrogates such as US Census population as well as historic data such as fuel and kerosene sales and boat registrations. This new data saw an overall decrease in engine populations in most sectors and reductions in emissions as well. For this effort EPA is considering whether they will provide an updated NONROAD input database or develop adjustment factors to apply after MOVES2014a NONROAD runs are complete.

Gil Grodzinsky conducted a similar test of improving growth rates for some sectors and found similar results for the sectors they analyzed.

It should be noted that aircraft ground support equipment and oil and gas equipment from NONROAD is not used and will not fall under the purview of this group.

Mark Janssen brought up the issue of whether some of this work could be taken outside of the NONROAD model and would like to block off time to hear from others on what they have done in individual states.

In subsequent calls we would like to plan on having members of the workgroup present some of their findings and methodology. Sarah Roberts proposed looking at sectors in order of emissions importance. We will start with agriculture and construction next month.

Datasets should be sent to Sarah Roberts (Roberts.Sarah at and Alison Eyth (Eyth.Alison at at EPA as well as Joseph Jakuta at OTC (jjakuta at

Action Items

  • If you would like to receive information and you are not on the distribution list please contact Sarah Roberts (Roberts.Sarah at
  • Everyone should look at the 2016 nonroad inventory and the NEI documentation to understand how base year data is developed.
  • We need to identify areas where data can be improved, populations or activity, including state data, and whether we should target particular sectors.
  • Everyone should become familiar with the updates EPA plans on making to NONROAD in MOVES.
  • Joseph Jakuta and Sarah Roberts will work on a workgroup charge prior to the next call; will circulate to the group
  • Sarah Roberts will send out an email to inform everyone of the next meeting and the sectors to focus on (agriculture and construction).
  • If you would like to share work that’s been done at the local, state, and regional level to improve emissions estimates from the Construction and Agriculture nonroad equipment sectors, please send a note to me and Joseph by COB Monday, March 19th.
  • If anyone has any preferences for dividing the nonroad inventory into smaller sizes for review send them to Sarah and Joseph.

Next Call: Thursday, March 22 3:30 pm EST