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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.


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 inventory parameters and point source data from the inventory. 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. 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)

Option 2

Point data for selected pollutants from EPA's 2014v2 modeling platform. The point data are for non-fire inputs (e.g., point oil & gas, point egu, and point nonipm). The 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.

Reviewing Agency2014NEIv2 InventoryCommentsAttachmentsDate
AlbuquerqueAll sectorsNo need for any changes 5/17/2018
IdahoRWCUpdates to 2014v2 RWC inventories for IdahoIdaho Comments; 2014 NEIv2 RWC Corrected5/30/2018
New Mexico    
North DakotaPoint sources and other sectorsInventories look reasonableNorth Dakota Comments5/30/2018
South Dakota