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Recent Additions
SCRAM RSS Feed & Archive
5/3/13 An updated release of the beta MMIF utility has been posted. Version 2.3 incorporates bug fixes identified by the user community and efficiency improvements. A MMIF Change Log is provided to account for notable changes from the original MMIF release in 2009.
4/25/13 The presentations from the 2013 EPA Regional, State, and Local Modelers' Workshop are now available (Clickable links on the referenced PDF).
3/25/13 The comment period for the Draft Guidance for PM2.5 Permit Modeling has been extended through May 31, 2013 to allow more time for the permit modeling community to throughly review and adequately prepare comments for the draft guidance document.
3/13/13 The Draft Guidance for PM2.5 Permit Modeling webinar presentation is now available.
3/8/13 A clarification memo regarding the "Use of ASOS Meteorological Data in AERMOD Dispersion Modeling." is now available. This clarification memo also discusses the development of the AERMINUTE meteorological data preprocessor.
3/6/13 An updated version of SCREEN3, dated 13043, has been posted on the Dispersion Modeling - Screening Models webpage. Model Change Bulletin #3 (MCB#3) summarizes the minor changes in SCREEN3, primarily to allow the program to execute correctly in newer computer operating systems.
3/4/13 The Draft Guidance for PM2.5 Permit Modeling is now available for public review and comment through May 31, 2013. There is an accompanying PM2.5 SILs/SMC Court Decision Question and Answer Document that provides additional context for the draft guidance document with regards to the January 22, 2013, United States Court of Appeals for the District of Columbia Circuit decision concerning PM2.5 SILs and SMC.
1/18/13 An updated version of AERSURFACE, dated 13016, has been posted on the Dispersion Modeling - Related Programs webpage. Model Change Bulletin #1 (MCB#1) provides a summary of the changes incorporated into version 13016 of AERSURFACE, and a minor update to the AERSURFACE User's Guide is also provided.
12/28/12 The Modeled Attainment Test Software (MATS) has been updated to version 2.5.1.
12/20/12 An updated version of CAL3QHCR, dated 12355, has been posted. A summary of changes can be found in MCB#7.
12/17/12 An updated version of AERMOD, dated 12345, has been posted on the AERMOD webpage. Model Change Bulletin #8 (MCB#8) provides a summary of the changes incorporated into version 12345 of AERMOD, and an update to the AERMOD User's Guide Addendum is also provided.
12/17/12 An updated version of AERMET, dated 12345, has been posted on the AERMET webpage. Model Change Bulletin #3 (MCB#3) provides a summary of the changes incorporated into version 12345 of AERMET, and an update to the AERMET User's Guide Addendum is also provided.
12/4/12 A Rich Site Summary (RSS) feed has been added to the SCRAM website to allow the modeling community to automatically track new postings and additions to the website.
11/29/12 The "Comparison of Single-Source Air Quality Assessment Techniques for Ozone, PM2.5, other Criteria Pollutants and AQRVs" report is now available.
11/29/12 The "Evaluation of Chemical Dispersion Models using Atmospheric Plume Measurements from Field Experiments" report is now available.
10/5/12 The Summary of Comments documentation package for the 10th Conference on Air Quality Modeling is now available.
8/30/12 The NO2/NOx In-Stack Ratio (ISR) Database and information on the related NO2/NOx ISR data collection effort are now available.
8/27/12 The EPA-approved version of CALPOST has been updated to version 6.221 (level 080724).
6/21/12 The full transcripts and the presentations given at the 10th Conference on Air Quality Modeling have been posted.
This website is maintained by EPA's Air Quality Modeling Group (AQMG). The AQMG conducts modeling analyses to support policy and regulatory decisions in the Office of Air and Radiation (OAR) and provides leadership and direction on the full range of air quality models and other mathematical simulation techniques used in assessing control strategies and source impacts. Documentation and guidance for these air quality models can be found on this website, including downloadable computer code, input data, and model processors.
You will need Adobe Acrobat Reader to view the Adobe PDF files on this site. See EPA's PDF page for more information about getting and using the free Acrobat Reader.
This site contains the following sections.
Air Quality Models - Provides descriptions and documentation for three types of air quality models: dispersion, photochemical, and receptor models. Also provided with the dispersion modeling section are source code and associated user's guides and documentation for preferred/recommended models, screening models, and alternative models.
Modeling Applications and Tools - Provides more detailed information on modeling analyses AQMG has conducted to support policy and regulatory decisions in OAR including assessment of control strategies and source culpability. In addition, this site provides access to EPA developed tools for use in State Implementation Plan (SIP) demonstrations and other air quality modeling assessments.
Modeling Guidance & Support - Provides current guidance for applying air quality models for regulatory applications for both State Implementation Plans (SIP) demonstrations and revisions, as well as permit applications for new source reviews including Prevention of Significant Deterioration (PSD) regulations. Included is the Model Clearinghouse which is designed to help record the interpretation of modeling guidance for specific regulatory applications. Also included in this area are links to modeling contacts within the EPA Regional Offices and State environmental agencies.
Meteorological Data & Processors - Provides information on Meteorological data used in air quality models as derived from both ambient measurements and meteorological models. Processors based on these two main sources of meteorological data are also provided.
Conferences & Workshops - Provides announcements and related information for upcoming meetings, conferences, and workshops including agendas, review materials, and links.
Reports & Journal Articles - Provides access to reports developed by AQMG staff as well as a bibliographic listing of journal articles they have authored or co-authored.
Related Links --- Provides website links of interest to air quality modelers and policy analysts.
About AQMG -Provides a link to the group's website with background information, principle roles/responsibilities, staff names and contact information.
Employment Opportunities: AQMG currently has no open positions to fill. As positions become open, AQMG will update this website with details. In addition, job announcements can be found on the internet at the Office of Personnel Management website. The easiest way to find the announcement is to look for openings located in Research Triangle Park, North Carolina.
If you would like to be notified when we have a position for which you may be interested in applying, you may send a resume to Tyler Fox, Group Leader at: Fox.Tyler@epa.gov.