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You are here: EPA Home Technology Transfer Network Clearinghouse for Inventories &

Emissions Factors Emissions Inventory Information 2008 National Emissions Inventory Data &

Documentation

The National Emissions Inventory

The National Emissions Inventory (NEI) is a comprehensive and detailed estimate of air emissions

of both Criteria and Hazardous air pollutants from all air emissions sources. The NEI is prepared

every three years by the USEPA based primarily upon emission estimates and emission model

inputs provided by State, Local, and Tribal air agencies for sources in their jurisdictions, and

supplemented by data developed by the USEPA. The 2008 NEI was built from emissions data in

the Emissions Inventory System (EIS).

Version History: Data from previous versions of the 2008 inventory are no longer available.

(For a detailed list of caveats and changes from versions 1 and 1.5, please see the Version

2 issues file.

Version 2 (April 10, 2012): Key updates are the use of the MOVES model for onroad mobile

sources, a review and update of hazardous air pollutant emissions and additions of

wildfires, prescribed burning and biogenic emissions.

Version 1.5 (released May 16, 2011): Key updates are to include the nonpoint data and

major updates to point sources in Indiana, Maryland, Nebraska, and Lincoln/Lancaster air

agencies.

Version 1 (released April 4, 2011)

Detailed documentation for each of the five data categories Point, NonPoint, OnRoad, NonRoad,

and Event are available below.

2008 National Emissions Inventory Data

The data posted at this site will include only the latest version of the 2008 NEI. This

webpage should not be used as a reference for past versions of the NEI, and users

wanting a record of data used in their analysis should archive and document those

inventories to meet their own archival needs. Users should not assume that the data

posted on this site will stay the same as the data they use at a given point in time.

Sector Summaries - Criteria and Hazardous Air Pollutants by 60 EIS

emission sectors

*A complete sector file is provided below under "Additional Summary Data". To use the multiple

selection boxes hold CTRL and click on options you would like to include in your query. To select

multiples in order, click your first option then hold SHIFT + click the last selection to highlight

everything in between. To unselect options use the same method as with selecting. Please allow

time for large queries to process (i.e. county aggregated for all pollutants, all sectors, all

regions).

This site uses pop-up windows, click here for help on allowing pop-ups from this site

National / State / County or Tribe Geographic Aggregation

Technology Transfer Network

Clearinghouse for Inventories & Emissions Factors

http://www.epa.gov/ttnchie1/net/2008inventory.html

Last updated on Tuesday, July 10, 2012
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National State County or Tribe

Region 1 - Connecticut

Region 1 - Massachusetts

Region 1 - Maine

Region 1 - New Hampshire

Region 1 - Rhode Island

Region 1 - Vermont

Region 2 - New Jersey

Pollutant Sector

CAP - Ammonia

CAP - Carbon Monoxide

CAP - Nitrogen Oxides

CAP - PM Condensible

CAP - PM10 Filterable

CAP - PM10 Primary (Filt + Cond)

CAP - PM25 Filterable

Agriculture - Crops & Livestock Dust

Agriculture - Fertilizer Application

Agriculture - Livestock Waste

Biogenics - Vegetation and soil

Bulk Gasoline Terminals

Commercial Cooking

Dust - Construction Dust

Create CSV File

Tier 1 Summaries - Criteria Air Pollutants only by 14 major tiers

National / State / County or Tribe Geographic Aggregation

National State County or Tribe

Region 1 - Connecticut

Region 1 - Massachusetts

Region 1 - Maine

Region 1 - New Hampshire

Region 1 - Rhode Island

Region 1 - Vermont

Region 2 - New Jersey

Pollutant Tier 1 Category

CAP - PM10 Filterable

CAP - PM10 Primary (Filt + Cond)

CAP - PM2.5 Filterable

CAP - PM2.5 Primary (Filt + Cond)

CAP - Sulfur Dioxide

CAP - Volatile Organic Compounds

Fuel Combustion - Electric Utility

Fuel Combustion - Industrial

Fuel Combustion - Other

Chemical & Allied Product Manufacturing

Metals Processing

Petroleum & Related Industries

Other Industrial Processes

Create CSV File

SCC Data Files

The full detail data files for the Point, Onroad, Nonroad and Nonpoint data categories can

be downloaded from the following drop-down menu. Please note these files are larger

than previous inventories and can be linked in Access if importing fails.

Point Download

Additional Summary Data
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Tribal Lands Emissions Summaries

Sector (Includes both criteria and hazardous air pollutants)

Tier 1 (Includes criteria pollutants only)

Facility Emissions Summaries

Facility-level by Pollutant

All Sector: National - county aggregated - sector file

Biogenics: Various levels of aggregation all the way down to monthly county emissions

Fusion Tables

Fusion Tables (by Google) allow mapping data, creating charts, and using tabular data, including

viewing, filtering, summing, and downloading. You can use the links below to access the 2008

NEI data using Fusion Tables. Google’s feedback link is the best way to ask for improvements

since Google is trialing Fusion Tables – this link is under the gear icon at the upper right of the

Fusion Table pages.

Instructions on using Google Fusion Tables (PDF, 238 KB)

Facility total emissions tables and maps

CO VOC NOX SO2 PM2.5 PM10 NH3 Lead Mercury

All criteria pollutants and mercury

2008 NEI Version 2 Technical Support Documentation (Draft)

The 2008 NEI Technical Support Document is a draft and using an improved format from past

documents. Although in draft form, this version provides all of the documentation available in

past 2008 NEI releases as well as additional analysis about the sources of data used in the NEI.

Placeholder sections are included so that major section numbers will not change in future

verisons. This draft document will be replaced with updaed versions as they become available.

Requests for updated sections can be made to the Info CHIEF Help Desk at info.chief@epa.gov.

2008 NEI Technical Support Document, Draft (pdf, 3.6 MB updated 6/2012)

Appendices, Draft (pdf, 1.2 MB, updated 7/2012)

Supporting Data and Summaries (updated 6/2012)

See Section 8 of the Technical Support Document for a list of supporting files and their

contents. The contents are accurate and not draft, though more supporting data may be

added later.

References (updated 5/2012)

Throughout the documentation, references are made to EPA documents developed as part of

the 2008 NEI effort. these are available in this zipped file. See also Section 8 of the Technical

Support Document.

Description of NEI Data Categories

The NEI Point data category contains emissions estimates for sources that are individually

inventoried and usually located at a fixed, stationary location, although portable sources such

as some asphalt or rock crushing operations are also included. Point sources include large

industrial facilities and electric power plants, but also increasingly include many smaller industrial

and commercial facilities, such as dry cleaners and gas stations, which had traditionally been

included in Nonpoint sources. The choice of whether these smaller sources are estimated

individually and included as point sources or inventoried as a NonPoint source County or Tribal

area aggregate is determined by the separate State, Local, or Tribal air agency.

The NEI NonPoint data category contains emissions estimates for sources which individually

are too small in magnitude or too numerous to inventory as individual point sources, and which

can often be estimated more accurately as a single aggregate source for a County or Tribal

area. Examples are residential heating and consumer solvent use.
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The NEI OnRoad and NonRoad data categories contain mobile sources which are estimated for

the 2008 NEI v2 via the MOVES and NONROAD models, respectively. NONROAD was run within

the National Mobile Inventory Model (NMIM). Note that emissions data for aircraft, locomotives,

and commercial marine vessels are NOT included in the NonRoad data category starting with the

2008 NEI. Aircraft engine emissions occurring during Landing and Takeoff operations and the

Ground Support Equipment and Auxiliary Power Units associated with the aircraft are now

included in the point data category at individual airports in the 2008 NEI. Emissions from

locomotives that occur at rail yards are also included in the point data category. In-flight

aircraft emissions, locomotive emissions outside of the rail yards, and commercial marine vessel

emissions (both underway and port emissions) are included in the NonPoint data category.

The Events data category includes wildfires,wild land fire use and prescribed burns. Wild land

fire use has been included in the "Fires - Wildfires" sector. Emissions for these are presented as

county totals on this website.