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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

    EPA's 2020 NEI and Trends Report

So you want to know more about the NEI...

Whether you want to get data, report data, or just know more about the National Emissions Inventory, you've come to the right place.

  • Get Emissions Data

    Ozone on a map of the US

    Summaries, reports, and detailed data from the National Emissions Inventory (NEI), modeling platforms, and emissions trends.

    Get Emissions Data
  • Report Emissions Data

    Cows loom and forage in front of a fenced in industrial facility

    Resources for State, Local, and Tribal Entities on requirements for reporting under the Air Emissions Reporting Rule (AERR), and for Industry Owners & Operators reporting using the Combined Air Emissions Reporting System (CAERS).

    Report Emissions Data
  • General Emissions Inventory Information

    More information about the methods and science, SIP emissions guidance, conferences, and training.

    Training, Conferences, SIP Guidance

Related Site Links

  • Emissions Inventory System (EIS)
  • Combined Air Emissions Reporting System (CAERS)
  • Air Emissions Modeling 
  • AirKnowledge
  • Source Classification Codes (SCCs)
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Last updated on May 6, 2025
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