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.
07/27/17 - The 2017 EPA Regional, State, and Local Modelers' Workshop Informational and Registration Website is now available, including a Draft Agenda (2 pp, 44 KB, About PDF). The Workshop is scheduled for September 25th and 26th on the EPA RTP, NC Campus.
07/11/17 – An Informational Webinar (28 pp, 522 KB, About PDF) regarding the establishment of appropriate Modeling Domain, Source Data, and Background Concentrations under Section 8 of the revised Guideline on Air Quality Models is available for reference.
07/11/17 – The Informational Webinar (7 pp, 337 KB, About PDF) regarding O3 and Secondary PM2.5 assessments under Section 5 of the revised Guideline of Air Quality Models is available for reference.
06/05/17 - A revised version of the AERMOD Model Formulation and Evaluation Document (238 pp, 5.8 M, About PDF) is available. The revision includes an appendix evaluating low wind model performance.
05/26/17 - A Compilation of Comments document (182 pp, 11.5 MB, About PDF) regarding the Draft Guidance on the Development of Modeled Emission Rates for Precursors (MERPs) as a Tier 1 Demonstration Tool for Ozone and PM2.5 under the PSD Permitting Program (79 pp,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. The February 23, Data Distribution and Errata memorandum (6 pp, 476 KB, About PDF) and the January 19, Draft MERPs Guidance Webinar presenation (27 pp, 294 KB, About PDF) are also available for reference.
05/26/17 - A Compilation of Comments document (43 pp, 5.2 MB, About PDF) regarding the Draft PM2.5 Precursor Demonstration Guidance is now available.
05/22/17 - The final revisions to the Guideline on Air Quality Models, as published in the Federal Register on January 17, 2017, are now effective. An Informational Webinar presentation (83 pp, 1.1 MB, About PDF), presented on February 16, is also available for reference.
03/21/17 - The Informational Webinar (42 pp, 2.5 MB, About PDF) regarding the use of prognostic met data for NSR permit modeling and specifically the EPA’s Mesoscale Model InterFace (MMIF) is available for reference.
03/08/17 – Clarification Memorandum (4 pp, 357 KB, About PDF) on the AERMOD Modeling System version for use in SO2 implementation efforts and other regulatory actions.
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