Area Designations for 2006 24-Hour Fine Particle (PM2.5) Standards
Regulatory Actions
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This page contains a list of regulatory actions and correspondence related to the 2006 PM2.5 standard.
January 26, 2011 - EPA has issued a final Federal Register notice designating as “nonattainment” or “unclassifiable/attainment” three areas (Pinal County, Arizona; Plumas County, California; and Shasta County, California) and their respective surrounding counties that were deferred in the November 13, 2009 promulgated designations for the 2006 24-Hour national ambient air quality standards for fine particulate matter, also called PM2.5.
Federal Register Notice (PDF) (11pp, 219k) - Federal Register - Feb 3, 2011Fact Sheet (PDF) (4pp, 96k)
Map of 24-hour PM2.5 Nonattainment Areas
Table Showing Final Nonattainment Counties by State
Timeline for Implementing the 24-hour PM2.5 Standard
October 8, 2009 - EPA has issued a final Federal Register notice designating areas throughout the U.S. 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) (95 pp, 404KB)Fact Sheet
Area Status - December 2008
December 22, 2008 - EPA signed a notice outlining area status for the 24-hour national air quality standards for fine particulate matter. This notice never became effective.
Federal Register Notice (PDF) (203 pp, 786KB)Table Showing Area Status - December 2008
August 21, 2008 - EPA has announced it will accept public comment on the Agencys 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 Representatives
Fact 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