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

03/20/19 – A Model Clearinghouse Concurrence Memorandum to Region 5 regarding the use of a BLP/AERMOD hybrid alternative model approach for modeling buoyant fugitive emissions from coke oven batteries in complex terrain at the AK Steel – Mountain State Carbon – Follansbee Plant has been added to the MCHISRS database.

02/28/2019 - The 2019 EPA Regional, State, and Local Modelers' Workshop Informational and Registration Website is now available, including a Draft Agenda. The Workshop is scheduled for May 7-9, 2019 at the EPA Region 10 / Pacific Northwest Headquarters in Seattle, WA.

02/21/19 - A Draft AERSURFACE (version 19039_DRFT) is now available for review and comment. A webinar regarding the Draft AERSURFACE release will be conducted on Thursday, April 4, 2019 from 2:00-3:00p EDT.

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 is now available.

11/05/18 - MMIF version 3.4 is now available. Version 3.4 fixes bugs that impact CALPUFF and SCICHEM domains, sets AER_MIN_SPEED to a default of 0.0 per recent MMIF Guidance changes, as well as other bug fixes.

04/24/18 - An updated version of AERMOD Modeling System (dated 18081) is now available. Specifically, the AERMET, AERMAP, and AERMOD executables, source code, documentation, and test cases, as well as, the AERSCREEN test cases have been revised.

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).

09/19/17 - A compilation of AERMOD Development White Papers (40 pp, 817 KB, About PDF) are now available for review.

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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