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Air Emissions Inventories

Learn More about the NEI

The National Emissions Inventory (NEI) is a detailed estimate of air emissions that include criteria pollutants and hazardous air pollutants. Learn more about the NEI
2020 NEI Release

The 2020 NEI has been released! Learn more about the 2 020 NEI
Proposed updates to the Air Emissions Reporting Rule

On July 25, 2023, EPA announced proposed updates to the Air Emissions Reporting Requirements (AERR). Learn more about the AERR

Reports and Summaries

New Interactive 2020 NEI Report

Interactive 2020 NEI report
Previous NEI Reports

Interactive 2017 NEI report and data exploration tool.

Interactive 2014 NEI report and data exploration tool.

2008 and 2011 NEI reports in PDFs.
Air Pollutant Emissions Trends Data

Current emissions trends data and documentation of estimation methods.

Data and Documentation

Current and recent NEIs

Comprehensive and detailed estimate of air emissions.
Earlier NEIs

Previous versions of NEI summaries.

Data Submission Program

Air Emissions Reporting Requirement (AERR)

Requires state and local agencies to collect and submit emissions data.
EIS Gateway

Provides access to emissions inventory data.
EIS User How To's

Provides instructions to assist users in submitting and retrieving various types of data from EIS.
EIS Bridge Tools

Tools for developing submission files to EIS.

Resources

Training

Procedures for loading data into the EIS.
Conferences

Exchange of information from State, Local, Tribes and government agencies.
Emissions Development Tools

Tools and resources used to develop inventories.

Guidance

Emissions Inventory Guidance

Gu idance on developing emission inventories to meet State Implementation Plan (SIP) requirements.

Methodology Improvements

Emission Sectors

Plans for new and improved emissions approaches.

See also Clearinghouse for Inventories and Emissions Factors (CHIEF)