Data / Federal rules / 2024-07397

Review of the Secondary National Ambient Air Quality Standards for Oxides of Nitrogen, Oxides of Sulfur, and Particulate Matter

The Environmental Protection Agency published this proposed rule in the Federal Register on April 15, 2024. Comments closed on June 14, 2024.

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What the agency says

Based on the Environmental Protection Agency's (EPA's) review of the air quality criteria and national ambient air quality standards (NAAQS) for oxides of nitrogen (N oxides), oxides of sulfur (SO<INF>X</INF>), and particulate matter (PM), the Environmental Protection Agency (EPA) proposes to revise the existing secondary sulfur dioxide (SO<INF>2</INF>) standard to an annual average, averaged over three consecutive years, with a level within the range from 10 to 15 parts per billion (ppb). Additionally, the Agency proposes to retain the existing secondary standards for N oxides and PM, without revision. The EPA also proposes revisions to the data handling requirements for the proposed secondary SO<INF>2</INF> NAAQS.

Key facts

Document number: 2024-07397
Type: Proposed rule
Action: Proposed rule
Agency: Environmental Protection Agency
Published: April 15, 2024
Comments due: June 14, 2024
Dates: Comments must be received on or before June 14, 2024.
Docket: EPA-HQ-OAR-2014-0128; FRL-5788-02-OAR
Regulation ID (RIN): 2060-AS35
Code of Federal Regulations: 40 CFR 50
Topics: Air pollution control; Carbon monoxide; Environmental protection; Lead; Nitrogen dioxide; Ozone; Particulate matter; Sulfur oxides
Significant: Yes, under Executive Order 12866
Pages: 82

The document on federalregister.gov PDF

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Everything from the Environmental Protection Agency · Rules on air pollution control · Rules on carbon monoxide · Rules on environmental protection · Published in April 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.