EPA Plans Minor Update to MOVES

EPA is planning a minor update to MOVES2014.  We are targeting release for summer 2018.

EPA’s MOtor Vehicle Emission Simulator (MOVES) is a state-of-the-science emission modeling system that estimates emissions for mobile sources at the national, county, and project level for criteria air pollutants, greenhouse gases, and air toxics. As compared to the current MOVES2014a, MOVES2014b will be a “minor” update to MOVES that will not change onroad emission inventories for criteria pollutants (e.g., this minor update will not affect transportation conformity analyses). However, it will improve emission estimates for nonroad mobile sources, which may be used in developing state implementation plans (SIPs).

In particular, the update will improve nonroad engine population growth rates, nonroad Tier 4 emission rates, and sulfur levels of nonroad diesel fuels.   A draft technical report that describes much of this work are currently available on EPA’s Science Inventory web site:


EPA is now testing and quantifying the net impacts of the changes compared to MOVES2014a.  We will share that information as part of the MOVES2014b release.

Separate from MOVES2014b, we continue to work on the next “major” update to MOVES, including changes to onroad emissions & activity.  Timing is still being determined, but that release will be in 2019 at earliest.

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