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6.
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Description of content: Proposed
rule; notification of public hearing and conference - In this action, the
Environmental Protection Agency (EPA) proposes to revise the Guideline
on Air Quality Models ("Guideline"). The Guideline has been incorporated into EPA's
regulations, satisfying a requirement under the Clean
Air Act (CAA)
section 165(e)(3)(D) for the EPA to specify, with reasonable particularity,
models to be used in the Prevention
of Significant Deterioration (PSD) program. It provides EPA-preferred models and
other recommended techniques, as well as guidance for their use in predicting
ambient concentrations of air pollutants. In this action, the EPA is
proposing revisions to 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. Within this action, the EPA is also announcing the Thirteenth
Conference on Air Quality Modeling and invites the public to participate in
the conference. The conference will focus on the proposed revisions to the
Guideline, and part of the conference will also serve as the public hearing
for these revisions.
The public hearing for this action and the Thirteenth Conference on
Air Quality Modeling will be held 14-15 November 2023, from 8:30 a.m. to 5:00
p.m. Eastern Standard Time (EST).
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