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Recent Additions
4/14/09 The 2009 EPA Regional, State, and Local Dispersion Modeling Workshop will be held May 11-14, 2009 in Philadelphia, PA.
03/19/09 A revised AERMOD Implementation Guide (PDF) is available from the AERMOD model webpage. This update includes important information related to sources of terrain data for use in AERMAP, given expanded options available with the recent update to AERMAP dated 09040. Modelers are encouraged to document the source of elevation data used for AERMOD applications in the modeling protocol.
02/11/09 An updated version of AERMAP, dated 09040, is available from the AERMAP webpage. This incorporates significant changes to AERMAP, including support for use of NED elevation data in GeoTIFF format. AERMOD modelers are encouraged to carefully review Model Change Bulletin #2 and the User's Guide Addendum (697k, ZIP) to become familiar with this update.
10/17/08 The 9th Modeling Conference Presentations are now available.
10/08/08 The final agenda (PDF) (4pp, 17k) for the 9th Modeling Conference is now available.
09/26/08 A staff memorandum on "Technical Issues Related to CALPUFF Near-field Applications" (PDF) (16pp, 144k) has been posted on the CALPUFF model webpage.
09/25/08 The Federal Register Notice (PDF) (2pp, 50k) and Security/RSVP Information for the 9th Modeling Conference are now available.
08/29/08 The CALPUFF model update report (PDF) (32pp, 501k) for version 5.8, documenting EPA's assessment of the "VISTAS" version of the CALPUFF modeling system, is available from the CALPUFF model webpage.
08/14/08 A clarification memo entitled "Clarification on Regulatory Status of Calpuff for Nearfield Applications" (PDF) (7pp, 401k) has been issued related to permit modeling under Appendix W.
08/13/08 The 9th Modeling Conference will be held on October 9-10, 2008 at the EPA facilities in Research Triangle Park, NC. Details are pending.
01/16/08 The AERSURFACE User's Guide (PDF) (36pp, 936k) has been corrected to remove the reference to AERSURFACE as "draft" in the Preface. The AERSURFACE tool, dated 08009, is NOT in draft form.
01/16/08 The AERMET User's Guide (zip) (738k) has been revised to indicate that Section 5.4.2, Surface Characteristics, is "Under Revision." The AERMET User's Guide will be revised in the near future to be consistent with the recently updated AERMOD Implementation Guide (dated 01/09/08).
01/09/08 A revised AERMOD Implementation Guide (PDF) (21pp, 111k) is available from the AERMOD model webpage. This update includes important information related to application of the AERMOD model. Updated recommendations for determining surface characteristics are provided. These recommendations are incorporated in the AERSURFACE tool.
01/09/08 The AERSURFACE Tool is now available. This tool processes NLCD92 land cover data to determine surface characteristics for AERMOD, based on recommendations in the AERMOD Implementation Guide (PDF) (21pp, 111k).
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.