Skip to main content
U.S. flag

An official website of the United States government

Here’s how you know

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

HTTPS

Secure .gov websites use HTTPS
A lock (LockA locked padlock) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Emergency

This is not the current EPA website. To navigate to the current EPA website, please go to www.epa.gov. This website is historical material reflecting the EPA website as it existed on January 19, 2025. This website is no longer updated and links to external websites and some internal pages may not work. More information »

    • Environmental Topics
    • Air
    • Bed Bugs
    • Cancer
    • Chemicals, Toxics, and Pesticide
    • Climate Change
    • Emergency Response
    • Environmental Information by Location
    • Environmental Justice
    • Greener Living
    • Health
    • Land, Waste, and Cleanup
    • Lead
    • Mold
    • Radon
    • Research
    • Science Topics
    • Water Topics
    • A-Z Topic Index
    • Laws & Regulations
    • By Business Sector
    • By Topic
    • Compliance
    • Enforcement
    • Laws and Executive Orders
    • Regulations
    • Report a Violation
    • Environmental Violations
    • Fraud, Waste or Abuse
    • About EPA
    • Our Mission and What We Do
    • Headquarters Offices
    • Regional Offices
    • Labs and Research Centers
    • Planning, Budget, and Results
    • Organization Chart
    • EPA History
    • Staff Directory

Breadcrumb

  1. Home
  2. Clearinghouse for Inventories and Emissions Factors

Air Emissions Inventories, Modeling, Monitoring and Emissions Factors

Clearinghouse for Inventories and Emissions Factors (CHIEF) is a  collection of EPA resources dealing with air emissions data, estimates, monitoring, reporting, modeling and inventories.  Below are resources available.

  • Air Emissions Inventories

    Learn about the amount and type of pollutants released by humans and natural sources.

    Inventories
  • Air Emissions Modeling

    Find emissions model input based on National Emission Inventory databases.

    Air Emissions Modeling
  • Air Emissions Monitoring Knowledge Base

    a landscape with clouds

    Basic information about monitoring techniques by industry type and control technique.

    MKB

Electronic Reporting of Air Emissions

  • Basic Information about Electronic Reporting
  • Electronic Reporting Tool (ERT)
  • Compliance and Emissions Data Reporting Interface (CEDRI)
  • WebFIRE

Air Emissions Factors and Quantification

image of air tanks
  • Basic Information about Air Emissions Factors
  • AP-42
  • Emissions Factors Estimation Tools
  • Web Factor Information Retrieval System (WebFIRE)

Clearinghouse for Inventories and Emissions Factors

  • CHIEF Home
    • Air Emissions Inventories, Modeling, Monitoring and Emissions Factors
    • CHIEF Archive Search
    • CHIEF Listserv
    • Water 9
Contact Us About Clearinghouse for Inventories and Emissions Factors
Contact Us About Clearinghouse for Inventories and Emissions Factors to ask a question, provide feedback, or report a problem.
Last updated on October 23, 2024
  • Assistance
  • Ayuda
  • Arabic
  • Chinese (simplified)
  • Chinese (traditional)
  • Aide
  • Asistans
  • Korean
  • Assistência
  • Russian
  • Tulong
  • Vietnamese
United States Environmental Protection Agency

Discover.

  • Accessibility Statement
  • Budget & Performance
  • Contracting
  • EPA www Web Snapshot
  • Grants
  • No FEAR Act Data
  • Plain Writing
  • Privacy
  • Privacy and Security Notice

Connect.

  • Data
  • Inspector General
  • Jobs
  • Newsroom
  • Regulations.gov
  • Subscribe
  • USA.gov
  • White House

Ask.

  • Contact EPA
  • EPA Disclaimers
  • Hotlines
  • FOIA Requests
  • Frequent Questions

Follow.