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Air Emissions Inventories

2014 National Emissions Inventory (NEI) Data


The NEI database includes air emissions sources of both criteria of both criteria and hazardous air polluntants.  Data are available for many facilities and as county totals.  The 2014 NEI is the next inventory on the three-year cycle and the EPA will create it using data provided by State, Local and Tribal air agencies.  The Emissions Inventory System (EIS) helps the EPA to build the NEI.

2014 NEI Plan

2014 NEI Resources for State, Local, Tribal Agencies

Submittal Instructions and Supporting Data for 2014 NEI


Rail (locomotives) and Commercial Marine





The data posted at this site will include only the latest version of the 2014NEI.  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 time.

The full detail data files for the Point, Onroad, Nonroad and Nonpoint data categories can be downloaded from the list below. Please note these files are larger than previous inventories and can be linked in Access if importing fails. These Source Classification Code (SCC) data files do not include “events” data-wildfires and prescribed burning emissions. The events data can be found at the “Prescribed/Wildfires by Pollutant” link below under “Other Emissions Summaries”. To obtain a complete inventory total, please include these data in addition to the 4 SCC data files provided here.

Additional Summary Data

Files that can be used for air quality modeling can be found at the Air Emissions Modeling.

Sector Summaries - Criteria and Hazardous Air Pollutants by 60 EIS emission sectors

The following queries allow for generating custom data files and the results will be displayed on-screen with various options to download.    The queries are used to generate subset summaries of either Sector or Tier aggregations

*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 deselect options use the same method as with selecting. Please allow time for large queries to process (i.e. county aggregated for all pollutants, all regions, selected sector).

National / State / County or Tribe Geographic Aggregation
Pollutant Sector
*Query results will be displayed below.

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

National / State / County or Tribe Geographic Aggregation
Pollutant Tier 1 Category
*Query results will be displayed below.

The facility query provides a map of facilities for a selected state along with tabular data for the selected pollutant(s).  Please note that the map only displays if there are less than 25 pollutants selected.  If more than 25 pollutants are selected then only the tabular data will be displayed.

State Pollutant