Support Center for Regulatory Atmospheric Modeling (SCRAM)

Air quality modeling supports regulatory programs required by the Clean Air Act
Modeling helps us understand the impacts of air emissions

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Support Center for Regulatory Atmospheric Modeling (SCRAM)

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

05/16/2019 - The presentations from the 2019 EPA Regional, State, and Local Modelers' Workshop are now available.

05/16/2019 - The EPA is completing work on a website to host ongoing AERMOD development activities. The website has been updated with the 2019 versions of the AERMOD Development White papers for review and comment.

04/30/2019 - The final Guidance on the Development of Modeled Emission Rates for Precursors (MERPs) as a Tier 1 Demonstration Tool for Ozone and PM2.5 under the PSD Permitting Program (74 pp, 3.1 MB, About PDF) is now available. A spreadsheet (224 K) with the underlying maximum impact and MERPs information for each hypothetical source is also available for download.

04/04/19 - A Clarification Memo on additional Methods, Determinations, and Analyses to Modify Air Quality Beyond Exceptional Events is now available.

02/21/19 - A Draft AERSURFACE (version 19039_DRFT) is now available for review and comment. A webinar regarding the Draft AERSURFACE release was conducted on Thursday, April 4, 2019.

12/14/18 - Interim access and process for use of 1992 NLCD and NED Data is now available.

11/08/18 – The Technical Guidance for Demonstration of Inter-Precursor Trading (IPT) for Ozone in the Nonattainment New Source Review Program (38 pp, 10.1 MB, About PDF) is now available.

04/17/18 - The EPA has finalized the Guidance on Significant Impact Levels for Ozone and Fine Particles that may be used in the PSD permitting program.

10/19/17 - The preliminary 2028 visibility modeling data and results are now available through a transmittal memorandum (133 pp, 11 MB, About PDF) and accompanying technical support document (TSD) (363 pp, 33 MB, About PDF).

08/04/17 - A Clarification Memorandum (15 pp, 513 KB, About PDF) providing an alternative model demonstration for specific photochemical transports models establishing their fit for purpose in PSD compliance demonstrations for Ozone and PM2.5 and in NAAQS attainment demonstrations for Ozone, PM2.5 and Regional Haze is now available.

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