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Area Designations for 1997 Fine Particle (PM2.5) Standards

Timeline for Implementing the PM2.5 Standards

Information provided for informational purposes only Note: EPA no longer updates this information, but it may be useful for historical purposes. See the PM Designations Home Page for more recent information about PM Designations.

Date Action
February 2004* State designation recommendations to EPA
June 28- 29, 2004 EPA letters to States responding to PM2.5 designation recommendations
December 2004 EPA finalizes designations
February 2005 EPA proposes implementation rule
Early 2006 EPA finalizes PM2.5 implementation rule
April 2008 State implementation plans due
Up to April 2010 with extension up to 2015 possible Attainment dates for nonattainment areas (based on the previous 3 years of monitoring data)
* Consolidated Appropriations Bill of FY2004 requires designations by 12/31/04. SIP due dates for PM2.5 and regional haze are 3 years from effective date of PM2.5 designations.

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