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EPA/OAR | RIN: 2060-AS54 | Publication ID: Spring 2017 |
Title: Revision to the Guideline on Air Quality Models: Enhancements to the AERMOD Dispersion Modeling System and Incorporation of Approaches to Address Ozone and Fine Particulate Matter | |
Abstract:
This action finalized revisions to the Guideline on Air Quality Models, published as appendix W to 40 CFR part 51. The Guideline provides EPA-recommended models and other techniques for use in predicting ambient concentrations of pollutants for controlling air pollution sources in programs ranging from the Prevention of Significant Deterioration (PSD) permitting program to State Implementation Plans (SIPs). The Guideline fulfills a Clean Air Act mandate for the EPA to specify models with reasonable particularity to be used under specified conditions for purposes of the PSD permitting program. This action finalized important enhancements to the EPA's AERMOD near-field dispersion modeling system that established AERSCREEN as the recommended screening level model for simple and complex terrain settings, significantly improved the model's performance under stable/light wind conditions, allowed for the use of meteorological input data derived from prognostic meteorological models, provided additional options for the modeling of nitrogen dioxide, incorporated the treatment of buoyant line sources within AERMOD, and made other incidental modifications to the modeling system that have received peer and external review. Additionally, these revisions incorporated the use of photochemical modeling techniques to more adequately account for the secondary chemical formation of fine particulate matter and ozone associated with precursor emissions from single sources. |
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Agency: Environmental Protection Agency(EPA) | Priority: Substantive, Nonsignificant |
RIN Status: Previously published in the Unified Agenda | Agenda Stage of Rulemaking: Completed Actions |
Major: No | Unfunded Mandates: No |
CFR Citation: 40 CFR 51 | |
Legal Authority: 42 U.S.C. 7401 et seq. Clean Air Act |
Legal Deadline:
None |
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Timetable:
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Regulatory Flexibility Analysis Required: No | Government Levels Affected: Federal, Local, State, Tribal |
Small Entities Affected: No | Federalism: No |
Included in the Regulatory Plan: No | |
RIN Data Printed in the FR: No | |
Agency Contact: George Bridgers Environmental Protection Agency Office of Air and Radiation Bldg C, Research Triangle Park, NC 27711 Phone:919 541-5563 Fax:919 541-4511 Email: bridgers.george@epa.gov Tyler Fox Environmental Protection Agency Office of Air and Radiation D243-01, 1200 Pennsylvania Avenue NW., Washington, DC 20460 Phone:919 541-5562 Email: fox.tyler@epamail.epa.gov |