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.

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

Support Center for Regulatory Atmospheric Modeling (SCRAM)

  • The Guideline on Air Quality Models provides the requirements and recommendations for regulatory air quality modeling

  • Photochemical and Dispersion models are critical components of regulatory compliance demonstrations

  • Air quality modeling projects the impacts of air emissions to ensure regulatory compliance

  • Air quality modeling supports regulatory programs required by the Clean Air Act

This website provides access to air quality models and other mathematical simulation techniques used in assessing control strategies and source impacts. 

Air Quality Models

  • Dispersion Modeling
  • Photochemical Modeling
  • Receptor Modeling

Modeling Applications and Tools

  • Photochemical Modeling Applications
  • Photochemical Modeling Tools
  • Dispersion Modeling Applications
  • Multipollutant Modeling Applications

Modeling Guidance and Support

  • Permit Modeling Guidance
  • State Implementation Plan Attainment Demonstration Guidance
  • Applicable Guidance for Air Toxics Modeling
  • Model Clearinghouse
  • State and EPA Regional Modeling Contacts

Meteorological Data and Processors

  • Observational Meteorological Data
  • Meteorological Grid Models
  • Meteorological Guidance

Training and Resources

  • Conferences and Workshops
  • Reports and Journal Articles
  • Resources from Selected Organizations

Announcements

03/08/2023 - Save the dates of June 28-29 for the 2023 Regional, State, and Local Dispersion Modelers' Workshop. It will be a hybrid event (in-person at EPA Region 7 and virtual) for our co-regulatory partners.

12/15/2022 - A Model Clearinghouse Concurrence Memorandum to Region 1 regarding the use of AERCOARE-AERMOD as an alternative model for an Outer Continental Shelf permitting effort (Beacon Wind project) has been added to the MCHISRS database.

12/13/2022 - A Model Clearinghouse Concurrence Memorandum to Region 1 regarding the use of AERCOARE-AERMOD as an alternative model for an Outer Continental Shelf permitting effort (Mayflower Wind project) has been added to the MCHISRS database.

11/23/2022 - A Model Clearinghouse Concurrence Memorandum to Region 3 regarding the use of AERCOARE-AERMOD as an alternative model for an Outer Continental Shelf permitting effort (CVOW-C project) has been added to the MCHISRS database.

10/14/2022 - A Model Clearinghouse Concurrence Memorandum to Region 2 regarding the use of two case-specific alternative model approaches for a modeled attainment demonstration of the 2010 SO2 NAAQS for the Alcoa Massena aluminum smelter has been added to the MCHISRS database.

08/03/2022 - An updated version of SMAT-CE (v2.0) is now available.

07/29/2022 - The final Guidance for Ozone and Fine Particulate Matter Permit Modeling is now available. A release webinar was held on Thursday, August 11.

06/27/2022 - An updated version of AERMOD Modeling System (dated 22112) is now available, including new versions of AERMOD, AERMET, and MMIF (v4.0).

See Historical Announcements


AERMOD RSS Icon  SCRAM RSS Feed

Subscribe to this feed to receive Announcement information automatically to you RSS reader or email program.

Contact Us to ask a question, provide feedback, or report a problem.
Last updated on March 8, 2023
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.gov
  • Inspector General
  • Jobs
  • Newsroom
  • Open Government
  • Regulations.gov
  • Subscribe
  • USA.gov
  • White House

Ask.

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

Follow.