Data / Federal rules / 2024-27636

Guideline on Air Quality Models; Enhancements to the AERMOD Dispersion Modeling System

The Environmental Protection Agency published this final rule in the Federal Register on November 29, 2024. It took effect on January 28, 2025.

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What the agency says

In this action, the Environmental Protection Agency (EPA) promulgates revisions to the Guideline on Air Quality Models ("Guideline"). The Guideline has been incorporated into the EPA's regulations, satisfying a requirement under the Clean Air Act (CAA), for the EPA to specify, with reasonable particularity, models to be used in the Prevention of Significant Deterioration (PSD) program. The Guideline provides EPA-preferred models and other recommended techniques, as well as guidance for their use in predicting ambient concentrations of air pollutants. The EPA is revising the Guideline, including enhancements to the formulation and application of the EPA's near-field dispersion modeling system, AERMOD, and updates to the recommendations for the development of appropriate background concentration for cumulative impact analyses.

Key facts

Document number: 2024-27636
Type: Final rule
Action: Final rule
Agency: Environmental Protection Agency
Published: November 29, 2024
Takes effect: January 28, 2025
Dates: This rule is effective January 28, 2025.
Docket: EPA-HQ-OAR-2022-0872; FRL-10391-02-OAR
Regulation ID (RIN): 2060-AV92
Code of Federal Regulations: 40 CFR 51
Topics: Administrative practice and procedure; Air pollution control; Carbon monoxide; Environmental protection; Intergovernmental relations; Lead; Nitrogen oxides; Ozone; Particulate matter; Reporting and recordkeeping requirements; Sulfur oxides
Pages: 42

The document on federalregister.gov PDF

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Everything from the Environmental Protection Agency · Rules on administrative practice and procedure · Rules on air pollution control · Rules on carbon monoxide · Published in November 2024

Read from the Federal Register API, last updated 2026-10-23. The document on federalregister.gov is the official record; dates and dockets can change through later corrections. Free to reuse with credit to SpecStream under CC BY 4.0.