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EPA/AR RIN: 2060-AS54 Publication ID: Spring 2015 
Title: ●Revision to the Guideline on Air Quality Models: Enhancements to the AERMOD Dispersion Modeling System and Incorporation of Modeling Techniques to Address Fine Particulate Matter and Ozone 

This action would revise 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 Prevention of Significant Deterioration (PSD) to State Implementation Plans (SIPs). The Guideline fulfills a Clean Air Act mandate for EPA to specify models and techniques for air quality management purposes. There are important enhancements to the EPA's AERMOD near-field dispersion modeling system that will establish AERSCREEN as the recommended screening level model for simple and complex terrain settings, significantly improve the model performance under stable/light wind conditions, allow for the use of meteorological input data derived from prognostic meteorological models, provide additional options for the modeling of nitrogen dioxide, incorporate the treatment of buoyant line sources within AERMOD, and incidental modifications to the modeling system that have received adequate peer and external review. Additionally, this revision would incorporate 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.

Agency: Environmental Protection Agency(EPA)  Priority: Substantive, Nonsignificant 
RIN Status: First time published in the Unified Agenda Agenda Stage of Rulemaking: Proposed Rule Stage 
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
Action Date FR Cite
NPRM  05/00/2015 
Final Rule  12/00/2016 
Regulatory Flexibility Analysis Required: No  Government Levels Affected: State 
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
Air and Radiation
Bldg C,
Research Triangle Park, NC 27711
Phone:919 541-5563
Fax:919 541-4511

Tyler Fox
Environmental Protection Agency
Air and Radiation
D243-01, 1200 Pennsylvania Avenue NW.,
Washington, DC 20460
Phone:919 541-5562