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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.



A list of comments on the 2014 NEIv2 submitted by state and local agencies are provided in Table 1 in Section 4, below.

Key Outcomes

  • Summary of updates to the NEI provide by state and local agencies to the Subcommittee
    • Emissions updates showing magnitudes for key pollutants and comparisons to 2014 NEIv2 Table
  • Unpaved road dust

Reference Material

  • MOVES input submissions
    • 39 states and counties submitted CDBs for MOVES inputs. These are shown in the map (agencies that submitted local data for at least 1 CDB table are shown in dark blue. 2014 NEIv2 TSD Figure 6-1

Pending Issues and Tasks


August 30, 2018 (12PM MDT)- Workgroup Call 3

  1. Welcome, Roll Call, Note Taking – Farren
  2. Who submits minor source data to EPA? How does this vary by state in the NEI? Is this an issue for Regional Haze planning? When and to what degree to address? - Farren
  3. Next steps for Unpaved Road Dust analysis - Farren
  4. Oil & Gas Notice of Intent sources to be included in modeling for future scenario (NM has 3500 NOIs) – Farren and Roslyn Higgin
  5. Summary of emissions updates provided to the RHPWG EI & MP Subcommittee – is more review needed? – Rodger Ames and Farren
  6. Next steps on Regional Modeling Platform – seeking volunteers to review draft RFP and evaluate bidder responses – Tom
  7. Next call and agenda items – Farren and all


July 26, 2018 - Workgroup Call 2

  1. Recent updates from state NEI review
  2. Road Dust review needed (2011 vs 2014; border discontinuities)
  3. Point source stack parameter review (in progress)
  4. Minor-source inclusion needs (with nonpoint subtraction?)
  5. Recommendations for source-apportionment categories?


  • Meeting notes DRAFT
  • Default parameter IMPACT database
  • Stack parameter lookups for WRAP states
  • Area to point file Used to allocate airport ground support equipment in the nonpoint portion of the EI to specific known airport locations. It comes from the 2014 EPA Modeling Platform.
  • Link to WRAP Technical Support System (v1). See link to "PSAT Analysis" under "Source Apportionment Methods" at the bottom of the page for descriptions of different source apportionment methods used in Round 1 Regional Haze photochemical modeling, or used files directly from the modeling. Please see pages 4 and 5 in the PSAT Analysis method (TSS PSAT Methods June 2011.doc) for info about how Source Regions and Emissions Source Groups were defined – these are the default high-level categories that Frank mentioned on the call today, would be used again in Round 2 modeling.
  • Comparison of 2011 to 2014 NEI v2 PM10 for unpaved road dust: Map of 2014 NEI v2 PM10 unpaved road dust
    • Summary of Differences Going from 2011 to 2014 NEI:
      • Hawaii has an increase of 1136%
      • Oregon has an increase of 149%
      • Arizona has an increase of 60%
      • California, Washington and Utah have little to no change
      • Alaska, Colorado, Idaho, Montana, North Dakota, and Nevada have a decrease between 22% and 31%
      • New Mexico, South Dakota, and Wyoming have a decrease between 52% and 68%
    • Other Notes:
      • New Mexico and Oregon are clear outliers in the 2014 NEI v2, with 3 times the road dust of any other states.
      • Several counties in Colorado had 100% decreases. For instance, Denver county has 0 tons in the 2014 NEI v2.
      • California, Washington, Washoe County (Nevada), and Maricopa County (Arizona) all submitted their own unpaved road dust data to the 2014v2 NEI. All other states/counties values were estimated using the EPA tool.

June 28, 2018 - Workgroup Call 1

  1. Roll call
  2. Overview of charged tasks for Subcommittee (from WRAP workplan)
    1. Process and evaluate 2014 NEI and refinements (see wiki and evaluation memo suggesting criteria at: Initial review step for EPA's 2014v2 NEI is described in this May 22, 2018 memo.)
    2. Evaluate use of 2016 EPA modeling platform
    3. Develop and refine 2028 emission inventories
    4. Prepare modeling plan
    5. Prepare and evaluate meteorological data
    6. Perform dynamic model evaluations
    7. Conduct sensitivity testing
    8. Conduct/Evaluate AQ Modeling for BY and 2028 inventories
  3. Which states have reviewed the NEI summary and provided comment?
  4. Processing these revisions into a model-ready inventory
    1. Who, what when ?
    2. Example - do states have interest in updating construction dust to use county-specific PE-Index values (instead of single state value)
  5. Can someone describe how Oil & Gas was estimated for states that didn’t submit their own data for 2014 NEI? For intermountain states:
  6. What is the status of the modeling contractor? See attached file.


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. State 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 for EPA's 2014 NEIv2 (data originate from EPA's "allsector" county and tribal level inventories. (Note, these are the same data as were used in the spreadsheets in Option 1, above).above, although they include the entire US rather than just WRAP states).

2014 NEIv2 Map tools:

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 Option 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.

Table 1

StateReviewing Agency2014NEIv2 InventoryCommentsAttachmentsDate
AlaskaDAQAirport, marine, dust, wildfires, O&GSee attachmentAlaska comments7/25/2018
ArizonaAZDEQAll sectorsNo substitutions neededArizona comments6/27/2018
 AZDEQPoint source stack parametersList of descriptors for non-airport SCCs with missing stack parametersComments on point source SCCs, AZSCCDescriptors8/3/2018
 AZDEQPoint source stack parametersMissing stack parameter valuesReview of missing stack parameters9/14/2018
 Maricopa County AQD    
 Pima County DEQ Attached data were not submitted to EPA for inclusion into the 2014 NEIv2 dataset. These are Pima DEQ’s best estimates for 2014. Inventories include annual NOx and VOCs, along with OSD, estimates. Note that inventories represent the eastern portion of Pima County.Pima County comments, Pima_County.zip7/30/2018
 Pinal County    
 AlbuquerqueAll sectorsNo need for any changesAlbuquerque comments5/17/2018
CaliforniaCARBMobile SourcesEmail thread regarding use of CA's EMFAC vs. EPA's MOVES model for mobile source emissionsCARB Comments5/1/2018
 CARBFacility point sourcesCorrection data file for point source emissions from 13 facilitiesFacilities correction data file, Facilities correction memo7/18/2018
 CARBFacility point sourcesStack parameter updates for point source emissionsStack Parameters of CARB Point Sources Correction Data 8-14-2018, Stack Reference to Facility-Unit-Emissionsprocess 8-14-2018,Stack parameters update memo7/18/2018
 CARBNonpoint, Nonroadsee attachmentCARB Comments Huth7/20/2018
ColoradoCDPHEAll sectorsSectors appear consistent with [Colorado] dataColorado Comments5/16/2018
HawaiiHDoHSee comments and data attachmentsSee attached commentsHawaii comments; Hawaii Comparison of Phase 1 spreadsheet to HI SLEIS; HI Data Pt Src review6/13/2018
IdahoIDEQResidential wood combustionUpdates to 2014v2 RWC inventories for IdahoIdaho Comments; 2014 NEIv2 RWC Corrected5/30/2018
MontanaMTDEQAll sectorsNo changes to 2014 NEI; potential issues with O&G inventories in Big Horn Basin (review pending)Montana Comments6/14/2018
NevadaNDEPAll sectors, emphasis on major point sourcesNo changes at this time; Washoe County indicated their MOVES inputs were not includedNevada comments6/20/2018
New MexicoNMENVAll sectorsEPA’s change in methodology from 2011 to 2014 reduced road dust emissions by 50%. In 2014, VMT was obtained from a MOVES run instead of an NMIM run, and separated into paved and unpaved values based on census-region level ratios.New Mexico Comments 1, New Mexico Comments 27/19/2018,7/23/2018
North DakotaDoHPoint sources and other sectorsInventories look reasonableNorth Dakota Comments5/30/2018
OregonODEQnonpoint nonroad onroadEPA data is accurate for Oregon nonpoint, nonroad and onroad sources. See comments.Oregon Comments7/25/2018
 ODEQPoint sourcesEPA data are accurate for Oregon point sourcesOregon Comments Swab, Oregon Comments Stocum, Point source review materials8/6/2018
 ODEQUnpaved Road DustReview by the RHPWG EI & MP Subcommittee indicates abnormally high values for OREmail correspondence indicating WA may provide updates for OR unpaved road dust emissions9/5/2018
South DakotaDENRAll sectorsNo changesSouth Dadota Comments6/28/2018
UtahUDEQnon-point SOx, non-road mobile diesel locomotive SO2Updates provided, other sectors look OK for RH modelingUtah Comments, SOxDiscrepancyOpenBurningLandClearing_Utah, On- and Non-road Mobile Sources Comparison8/9/2018
WashingtonEYCConstruction DustEPA's emissions calculation methodology for construction dust is over-generalized for Washington stateWashington Comments, WA_2014_ConstructionDust_EI_Revisions.xlsx4/24/2018
 EYCFireplace emissionsUpdated fireplace emissions for four counties in the Puget Sound areaWA_2014_Fireplace_EI_Revisions.xlsx WA_2014_Fireplace_EI_Revisions.docx6/27/2018
WyomingWDEQUnpaved road; point sourcesRaised concerns for Unpaved Road Emission; recommendations for representativeness of point source emissionsWyoming Comments6/14/2018
 WDEQFacilities emissions not in NEISee attached50 Buttes and House Creek Emissions7/6/2014


  • 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