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Regulatory Actions
Regulatory Review Notice
EPA is in the process of reviewing several previous agency decisions, including those covered by the White House memo on regulatory review (memo in HTML | memo in PDF (2 pp, 51K, About PDF)). The rules under review are noted below.
You will need Adobe Reader to view some of the files on this page. See EPA's PDF page to learn more.
This page contains a chronological listing of regulatory actions and correspondence related to the 2006 PM2.5 standard.
- Under Review - EPA Designates Areas as Attainment and Nonattainment for the 24-Hour PM2.5 National Air Quality Standards
December 22, 2008 - EPA has issued a final Federal Register notice designating areas throughout the US as "nonattainment" and "unclassifiable/attainment" for the 24-hour national air quality standards for fine particulate matter, also called PM2.5.
Federal Register Notice (PDF) (203 pp, 786KB)Corrections Memo (PDF) (5 pp, 23KB)
Fact Sheet
Map of 24-hour PM2.5 Nonattainment Areas
Table Showing Final Designations by State
Timeline for Implementing the 24-hour PM2.5 Standard
August 21, 2008 - EPA has announced it will accept public comment on the Agency’s responses to the state and tribal recommendations regarding designations for the 24-hour fine particle standards. In addition to comments, EPA seeks supplemental information that may help establish the final nonattainment area boundaries. The Agency will accept comments for 30 days after the notice of availability is published in Federal Register.
Federal Register NoticeHow to Comment
August 19, 2008 – In response to recommendations from state and local tribal representatives, EPA has sent letters outlining the areas it is considering designating as “attainment” or “nonattainment” for the 24-hour fine particle standards.
Read Correspondence Between EPA and State and Tribal RepresentativesFact Sheet
Factors Considered as the Basis for Nonattainment Area Boundaries
Map of EPA responses to 24-hour PM2.5 recommendations
Table showing comparison of State/Tribal recommendations and EPA responses
Timeline for Implementing the 24-hour PM2.5 Standard