11/08/18 – The Technical Guidance for Demonstration of Inter-Precursor Trading (IPT) for Ozone in the Nonattainment New Source Review Program is now available.
11/05/18 - MMIF version 3.4 is now available. Version 3.4 fixes bugs that impact CALPUFF and SCICHEM domains, sets AER_MIN_SPEED to a default of 0.0 per recent MMIF Guidance changes, as well as other bug fixes.
10/30/18 - A Model Clearinghouse Concurrence Memorandum to Region 3 regarding the use of a BLP/AERMOD hybrid alternative model approach for modeling buoyant fugitive emissions from coke oven batteries in complex terrain at the AK Steel – Mountain State Carbon – Follansbee Plant has been added to the MCHISRS database.
08/23/18 - A Model Clearinghouse Concurrence Memorandum to Region 3 regarding the use of a BLP/AERMOD hybrid alternative model approach for modeling buoyant fugitive emissions from coke oven batteries in complex terrain at the U.S. Steel Mon Valley Works - Clairton Plant has been added to the MCHISRS database.
08/10/18 - The presentations from the 2018 EPA Regional, State, and Local Modelers' Workshop in Boston, MA are now available.
04/24/18 - An updated version of AERMOD Modeling System (dated 18081) is now available. Specifically, the AERMET, AERMAP, and AERMOD executables, source code, documentation, and test cases, as well as, the AERSCREEN test cases have been revised.
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.
03/28/18 - A Model Clearinghouse Concurrence Memorandum to Region 9 regarding the use of a BLP/AERMOD hybrid alternative model approach for modeling buoyant roofline sources has been added to the MCHISRS database.
03/13/18 - A Model Clearinghouse Concurrence Memorandum to Region 4 regarding the use of an alternative model technique to address two issues with modeling buoyant line sources in AERMOD has been added to the MCHISRS database.
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).
09/19/17 - A compilation of AERMOD Development White Papers (40 pp, 817 KB, About PDF) are now available for review.
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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