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Western U.S. regional analysis - emissions inventories for Regional Haze planning


For western U.S. regional analysis using photochemical modeling for Regional Haze, WESTAR-WRAP is assisting state air agencies in their review of the 2014v2 NEI. The process will allow participants to review and provide updates to these inventories . Feedback and revisions to the inventories may be incorporated into air quality modeling by the WRAP for regional photochemical modeling.


  • June 28, 2018 Workgroup Call 1 notes
  • July 26, 2018 Workgroup Call 2


The initial review step for EPA's 2014v2 NEI following a three phase process is described in this May 22, 2018 memo. The initial review aspects listed in the memo can be evaluated using 3 data review options below. Option 1 is a high level review will look at tabular state and county inventories for key pollutants. Option 2 will enable a more detailed review to examine additional inventory parameters, such as individual point sources. Option 3 will allow review of a map-based emissions inventory review tool provided by the IWDW. Additional description and materials for the review process are provided below. Subsequent memoranda for additional review of 2014NEIv2 and other base and projection inventories will be added over time.

Option 1

Sector summary spreadsheet and charting tool. CountyState and county level emissions totals for pollutants CO, NH3, NOx, PM10, PM2.5 and SO2.

2014v2_allsector_summary_WRAP_crosstab.xlsx (provided by Farren Herron-Thorpe, Washington State Dept. of Ecology)

Modified version of the above spreadsheet that includes state/tribal summaries and calculations of anthropogenic totals and 80% threshold. (see the "Readme" tab)

FHT2014NEIv2_summary.xlsx (provided by Roslyn Higgin, NMENV)

Facility emissions summaries from 2014 NEI v2. Excel spreadsheet with a list of all the facilities in each state, broken down by EI Sector, so that comparisons can be made to the sector summary if desired. There is also a sheet that lists all the facilities with a “Q” greater than 1 Ton.

WRAP_Facility_CAPs_Summary.xlsx (provided by Farren Herron-Thorpe)

Option 2

Data for individual point sources for 16 pollutants from EPA's 2014v2 modeling platform. The point data are for non-fire inputs (e.g. pt_oilgas, ptegu, ptnonipm, and cmv_c3 for California, Oregon and Washington). The Excel spreadsheets contain parameters such as annual emissions, facility name and ID, and stack parameters where applicable.

Option 3

Map-based emissions review tool on the IWDW (addition of 2014 NEIv2 and augmented inventories for regional haze modeling are pending)

Comment Memos from Reviewing Agencies

Comment memos from reviewing agencies are posted below by inventory reviewed. States may need to coordinate with tribes and local air agencies for review completeness. There may be multiple comment memos from an agency for the same inventory. These comments will be addressed in the processing of the inventories for regional haze modeling.

Note from Farren Herron-Thorpe regarding interpretation of the summary data spreadsheets under Phase 1, above:

I wanted to give some clarification regarding the NEI Sector Summary data that was sent out previously. The way that EPA separates this information is not immediately intuitive. This is because the sector summary is aggregated by SCC, not NAICS code. The SCC table that EPA provides has each SCC matched to an EI sector which is the basis for the sector summary.

For example, if you look at the emissions totals for “Industrial Processes – Petroleum Refineries”, it will be less than the total facility emissions for all petroleum refineries. All boiler emissions are added into the “Fuel Combustion – Industrial Boilers, xxxxx” category, even if they are at a refinery facility.

If you would like to see how your facilities have been split up amongst the sector summary categories, I can send you out a table for your state.

Reviewing Agency2014NEIv2 InventoryCommentsAttachmentsDate
ArizonaAll sectorsNo substitutions needed 6/27/2018
AlbuquerqueAll sectorsNo need for any changes 5/17/2018
CaliforniaMobile SourcesEmail thread regarding use of CA's EMFAC vs. EPA's MOVES model for mobile source emissionsCARB Comments5/1/2018
ColoradoAll sectorsSectors appear consistent with [Colorado] dataColorado Comments5/16/2018
HawaiiSee comments and data attachmentsSee attached commentsHawaii comments; Hawaii Comparison of Phase 1 spreadsheet to HI SLEIS; HI Data Pt Src review6/13/2018
IdahoRWCUpdates to 2014v2 RWC inventories for IdahoIdaho Comments; 2014 NEIv2 RWC Corrected5/30/2018
MontanaAll sectorsNo changes to 2014 NEI 6/14/2018
NevadaAll sectors, emphasis on major point sourcesNo changes at this time; Washoe County indicated their MOVES inputs were not includedNevada comments6/20/2018
New Mexico    
North DakotaPoint sources and other sectorsInventories look reasonableNorth Dakota Comments5/30/2018
South DakotaAll sectorsNo changes 6/28/2018
WashingtonConstruction Dust; Fireplace emissionsEPA's emissions calculation methodology for construction dust is over-generalized for Washington state; Updated fireplace emissions for four counties in the Puget Sound areaWashington Comments WA_2014_ConstructionDust_EI_Revisions.xlsx; WA_2014_Fireplace_EI_Revisions.xlsx WA_2014_Fireplace_EI_Revisions.docx4/24/2018; 6/27/2018
WyomingRaised concerns for Unpaved Road Emission; recommendations for representativeness of point source emissions; Facilities emissions not in NEISee attachedWyoming Comments; 50 Buttes and House Creek Emissions6/14/2018; 7/6/2014


  • Now available! *2014 National Emissions Inventory (NEI) Report* This new highly visual and interactive Report shows graphs, tables, and maps that summarize national and state emission trends and emission profiles for states and counties based on the 2014 NEI v2 data. With this tool, users can explore the emissions data and answer basic questions they have about the NEI and emission trends by looking at what the data shows for national, state, and local areas. The Report distills a considerable amount of data detail inherent to the NEI and provides emission summaries for the criteria pollutants, black carbon, and 5 select HAPs. It is not a query tool for accessing all details of the entire 2014 NEI data. NEI data access query tools and detailed data files remain available on the EPA NEI program website. Please explore the 2014 NEI Report and bookmark it on The Report is also posted on the NEI program website

  • The 2014v2 NEI Technical Support Document is posted on the 2014. NEI website

Future 2016 Modeling Platform Review