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. 

Training and Resources

Announcements

09/20/2024 - A Model Clearinghouse Concurrence Memorandum to Region 2 regarding the use of a site-specific alternative approach to demonstrate modeled attainment of the 2010 SO2 NAAQS at the Alcoa West Aluminum Smelter in Massena, New York has been added to the MCHISRS database.

08/27/2024 - A Model Clearinghouse Concurrence Memorandum to Region 2 regarding the use of AERCOARE-AERMOD as an alternative model for an Outer Continental Shelf permitting effort (Atlantic Shores P3Co Project) has been added to the MCHISRS database.

08/05/2024 - The final presentations from the 2024 Regional, State, and Local (RSL) Dispersion Modelers' Workshop are now available.

07/24/2024 - A Model Clearinghouse Concurrence Memorandum to Region 6 regarding the use of AERMOD-HBP as an alternative model for a 1-hour SO2 attainment demonstration SIP effort (Rusk-Panola Nonattainment Area) has been added to the MCHISRS database.

06/14/2024 - 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 (Vineyard Wind NE) has been added to the MCHISRS database.

04/30/2024 - Supplement to the Guidance on Significant Impact Levels for Ozone and Fine Particles in the Prevention of Significant Deterioration Permitting Program

04/30/2024 - Effective Permitting Tools for Fine Particulate Matter under the Prevention of Significant Deterioration Permitting Program Fact Sheet

10/23/2023 - The Federal Register publication, rule docket link, and supporting documentation with respect to a proposed rule that would revise the Guideline on Air Quality Models and information for the 13th Conference on Air Quality Models are now available.

10/23/2023 - An updated version of AERMOD Modeling System (dated 23132) is now available, including new versions of AERMOD, AERMET, and MMIF (v4.1).

See Historical Announcements

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Last updated on October 14, 2024