Support Center for Regulatory Atmospheric Modeling (SCRAM)

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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

01/18/17 - The draft MERPs webinar presenation is available for those unable to access the Adobe Connect webinar room. Please use the conference call line, 1-866-299-3188 with a conference code of 9195411850, for webinar audio.

01/17/17 - The final revisions to the Guideline on Air Quality Models were published in the Federal Register.

12/20/16 - Updated versions (v16216) of AERMOD, AERMET, and AERSCREEN are now available. An updated version (v3.3) of MMIF is also now available.

12/09/16 - The PM_2.5 Precursor Demonstration Guidance is available for consideration, review, and comment. The EPA will accept comment through Tuesday, January 31, 2017.

12/06/16 - The presentations Exit from the 2016 EPA Regional, State, and Local Modelers' Workshop are now available.

12/02/16 - The 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(79 pp, 1.6 MB, About PDF) is now available for consideration, review, and comment. A webinar discussing this draft guidance is also scheduled for Thursday, January 19, 2017 from 2:00-3:00p EST. The EPA will accept comment through Friday, February 3, 2017.

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