3.4 MOVES runs and Postprocessing Steps

MOVES was run for each county in a single, separate run specification file (runspec). All the runspecs are in the ‘2023_NonroadRunspecs.zip’ file in the online NRSupplemental Data folder. The MOVES-Nonroad runs were checked for completeness and absence of error messages in the run logs. The output was post-processed to consolidate each county into a single database and to produce SMOKE-ready inputs. The scripts that performed these processes are in ‘2023_postprocess_speciation.zip’ in the 2023 NEI Supplemental nonroad mobile data FTP site. The MOVES runs created monthly, day type (weekday and weekend) total inventories for every U.S. county, and post-processing scaled the day totals to monthly and annual values.

The following additional steps were taken on the monthly MOVES nonroad outputs to prepare data for loading into EIS:

  1. The gas and particle components of PAHs (e.g., Chrysene, Fluorene) were combined.
  2. The individual mercury species were combined into total mercury (i.e., pollutant 7439976).
  3. Emissions were aggregated from the more detailed SCCs modeled in MOVES to the SCCs modeled in SMOKE. Information about this aggregation is contained in the ‘2023NonroadSCCaggregation.xlsx’ file posted on the 2023 NEI Supplemental data ftp site.
  4. Pollutants produced by MOVES but not accepted in the NEI were removed (e.g., ethanol, NONHAPTOG, and total hydrocarbons).
  5. Five speciated PM2.5 species were added based on speciation profiles (i.e., elemental carbon, organic carbon, nitrate, sulfate and other PM2.5).
  6. DIESEL-PM10 and DIESEL-PM25 were added by copying the PM10 and PM2.5 pollutants (respectively) as DIESEL-PM pollutants for all diesel SCCs.
  7. Airport ground support equipment emissions were removed.
  8. Oil and gas field equipment emissions were removed.
  9. Incorporated California-submitted nonroad emissions.

Note that starting in 2022, the U.S. Census Bureau retired some Connecticut counties and assigned new county equivalents to more clearly illustrate the break in planning regions. Current Connecticut counties/county equivalents include Fairfield (FIPS 09001), Hartford (FIPS 09003), Litchfield (FIPS 09005), Middlesex (FIPS 09007), New Haven (FIPS 09009), New London (FIPS 09011), Tolland (FIPS 09013), and Windham (FIPS 09015). Because these updated counties are not yet reflected in MOVES, EPA permitted Connecticut to submit nonroad CDBs that are based on the pre-2022 counties and boundaries still reflected in MOVES. Connecticut provided county-equivalent apportionment factors by NONROAD equipment category. EPA then reapportioned Connecticut nonroad emissions to the current county areas prior to uploading emissions to the Emissions Inventory System (EIS). For example, emissions from Fairfield County (09001) were translated to the three new county equivalents which overlap Fairfield County: Greater Bridgeport (09120), Naugatuck Valley (09140), and Western Connecticut (09190).

Following the completion of the MOVES runs, railway maintenance emissions were removed from specific counties / census areas in Alaska because Alaska DEC specified that this type of activity does not happen in those areas. Specifically, emissions from SCCs 2285002015, 2285004015, and 2285006015 were removed from the following counties / census areas: 02013, 02016, 02050, 02060, 02070, 02100, 02105, 02110, 02130, 02150, 02164, 02180, 02185, 02188, 02195, 02198, 02220, 02240, 02261, 02275, and 02282. Alaska DEC also specified some counties / census areas in which logging and agricultural emissions do not happen, but the emissions for the specified SCCs were already zero in the specified areas.