06/18/2019 - Please save the dates of October 2-3, 2019 for the 12th Conference on Air Quality Models to be held on the EPA Campus in RTP, NC. A Federal Register notice will be available with more conference information by August.
06/13/2019 - The final MERPs Guidance webinar presentation from June 13th is now available.
06/11/2010 - MMIF has been updated to version 3.4.1 to support a new choice for cloud cover data, as well as to correct a bug for CALPUFF and SCICHEM modes when a user is providing MM5 output.
5/30/2019 - The final version of the Fine Particulate Matter (PM2.5) Precursor Demonstration Guidance is now available.
05/16/2019 - The presentations from the 2019 EPA Regional, State, and Local Modelers' Workshop are now available.
05/16/2019 - The EPA is completing work on a website to host ongoing AERMOD development activities. The website has been updated with the 2019 versions of the AERMOD Development White papers for review and comment.
04/30/2019 - The final 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 (74 pp, 3.1 MB, About PDF) is now available. A spreadsheet (224 K) with the underlying maximum impact and MERPs information for each hypothetical source is also available for download.
04/04/19 - A Clarification Memo on additional Methods, Determinations, and Analyses to Modify Air Quality Beyond Exceptional Events is now available.
02/21/19 - A Draft AERSURFACE (version 19039_DRFT) is now available for review and comment. A webinar regarding the Draft AERSURFACE release was conducted on Thursday, April 4, 2019.
12/14/18 - Interim access and process for use of 1992 NLCD and NED Data is now available.
11/08/18 – The Technical Guidance for Demonstration of Inter-Precursor Trading (IPT) for Ozone in the Nonattainment New Source Review Program (38 pp, 10.1 MB, About PDF) is now available.
04/17/18 - The EPA has finalized the Guidance on Significant Impact Levels for Ozone and Fine Particles that may be used in the PSD permitting program.
10/19/17 - The preliminary 2028 visibility modeling data and results are now available through a transmittal memorandum (133 pp, 11 MB, About PDF) and accompanying technical support document (TSD) (363 pp, 33 MB, About PDF).
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.
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