An official website of the United States government.

We've made some changes to EPA.gov. If the information you are looking for is not here, you may be able to find it on the EPA Web Archive or the January 19, 2017 Web Snapshot.

Air Emissions Inventories

2017 National Emissions Inventory (NEI) Data

Documentation

April 2020 version: This full 2017 NEI release supersedes the partial February 2020 and August 2019 NEI releases. The 2017 NEI is the first NEI released incrementally prior to this full release. The April 2020 NEI adds the following components that were not provided in the February 2020 release: nonpoint data category (including biogenics, commercial marine vessels, and rail line emissions), onroad data category, minor data additions and corrections provided by state, local, and tribal partners, and the components of particulate matter.

2017 NEI Data and Documentation


2017 NEI Development Documentation

2017 NEI Plan

2017 NEI Resources for State, Local, Tribal Agencies

Submittal Instructions and Supporting Data for 2017 NEI

Nonpoint

Commercial Marine

April 2020 version: This full 2017 NEI release supersedes the partial February 2020 and August 2019 NEI releases. The 2017 NEI is the first NEI released incrementally prior to this full release. The April 2020 NEI adds the following components that were not provided in the February 2020 release: nonpoint data category (including biogenics, commercial marine vessels, and rail line emissions), onroad data category, minor data additions and corrections provided by state, local, and tribal partners, and the components of particulate matter.

Additional Summary Data

Files that can be used for air quality modeling can be found at the 2017 Air Emissions Modeling page.

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.  CAP emissions are in short tons.

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.  CAP emissions are in short tons.

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
 
 *CAP emissions are in short tons.