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EPA/OAR RIN: 2060-AV92 Publication ID: Fall 2023 
Title: Revision to the Guideline on Air Quality Models: Enhancements to the AERMOD Dispersion Modeling System 

AERMOD is EPA’s preferred dispersion model for most near-field (≤ 50 km) applications, however, air dispersion science continues to advance. The need for technical improvements expressed by the stakeholder community that utilizes those advancements continue to be a motivation for the further development of AERMOD. Improvements to the scientific formulation of AERMOD, have been developed, tested, evaluated, and peer reviewed which improve model performance for specific source types and in certain situations. EPA is proposing revisions to the Guideline that would incorporate these improvements into AERMOD as part of the default regulatory formulation of the model. The proposed revisions to the Guideline would enable these formulation improvements to be used in a regulatory context without the approval for the use of a non-preferred alternative model by the appropriate EPA regional administrator and concurrence with the EPA’s Model Clearinghouse, as required per sections 3.2 and 3.3 of the current Guideline. EPA anticipates the proposed revisions will simplify compliance due to the improved model performance.

Agency: Environmental Protection Agency(EPA)  Priority: Substantive, Nonsignificant 
RIN Status: Previously 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  10/23/2023  88 FR 72826   
NPRM Comment Period End  12/22/2023 
Final Rule  06/00/2024 
Additional Information: EPA-HQ-OAR-2022-0872.
Regulatory Flexibility Analysis Required: No  Government Levels Affected: Local, State 
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