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Support Center for Regulatory Atmospheric Modeling (SCRAM)

Air Modeling - Announcements

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

08/18/16 A webinar regarding the Draft O3 and PM2.5 SILs Guidance for PSD Program (Slides from the webinar available on this webpage.) will be conducted on Wednesday, August 24, 2016 from 2:00p to 3:30p EDT.

08/04/16 The draft SOModeling Technical Assistance Document (PDF) has been updated to clarify receptor placement and the minimum number of years to model.

08/01/16 The Draft Guidance on SILs for Ozone and PM2.5 in PSD has been posted on the NSR Permitting website along with supporting documentation. The EPA will accept public comment on the draft guidance package through Septemebr 30, 2016.

07/26/16 Updated regulatory versions of CALPUFF and CALMET (version 5.8.5, dated 151214) are now available. The links to the updated CALPUFF Modeling System files, the associated Model Change Bulletin (MCB-H) can be found on the CALPUFF webpage.

12/10/15 A Clarification on the Approval Process for Regulatory Application of the AERMOD Modeling System Beta Options memorandum is now available. This memo discusses the appropriate process for the approval of the AERMOD Modeling System with the use of various beta options for regulatory applications.

12/04/14 The Draft Modeling Guidance for Demonstrating Attainment of Air Quality Goals for Ozone, PM2s, and Regional Haze is now available for consideration, review, and comment. This document is a revision to the previous modeling guidance which was released in April 2007.

04/08/14 Interim guidance for the treatment of condensable particulate matter test results in the PSD and NSR permitting programs is now available.

01/14/14 The draft SO2Monitoring and Modeling Technical Assistance Documents have been updated based on public comments and are available on the Sulfur Dioxide Implementation web page.

08/26/13 The NO2/NOx In-Stack Ratio (ISR) Database has been updated based on the first database submission from the State of Oklahoma and the second database submission from the State of Alaska.