Data / Federal rules / 2024-02637

Reconsideration of the National Ambient Air Quality Standards for Particulate Matter

The Environmental Protection Agency published this final rule in the Federal Register on March 6, 2024. It took effect on May 6, 2024.

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What the agency says

Based on the Environmental Protection Agency's (EPA's) reconsideration of the air quality criteria and the national ambient air quality standards (NAAQS) for particulate matter (PM), the EPA is revising the primary annual PM<INF>2.5</INF> standard by lowering the level from 12.0 [micro]g/m\3\ to 9.0 [micro]g/m\3\. The Agency is retaining the current primary 24-hour PM<INF>2.5</INF> standard and the primary 24-hour PM<INF>10</INF> standard. The Agency also is not changing the secondary 24-hour PM<INF>2.5</INF> standard, secondary annual PM<INF>2.5</INF> standard, and secondary 24-hour PM<INF>10</INF> standard at this time. The EPA is also finalizing revisions to other key aspects related to the PM NAAQS, including revisions to the Air Quality Index (AQI) and monitoring requirements for the PM NAAQS.

Key facts

Document number: 2024-02637
Type: Final rule
Action: Final rule
Agency: Environmental Protection Agency
Published: March 6, 2024
Takes effect: May 6, 2024
Dates: This final rule is effective May 6, 2024.
Docket: EPA-HQ-OAR-2015-0072; FRL-8635-02-OAR
Regulation ID (RIN): 2060-AV52
Code of Federal Regulations: 40 CFR 50; 40 CFR 53; 40 CFR 58
Topics: Administrative practice and procedure; Air pollution control; Carbon monoxide; Environmental protection; Intergovernmental relations; Lead; Nitrogen dioxide; Ozone; Particulate matter; Reporting and recordkeeping requirements; Sulfur oxides
Pages: 205

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 March 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.