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Area Designations for 2006 24-Hour Fine Particle (PM2.5) Standards

Timeline for Implementing the 24-hour PM2.5 Standard

Milestone Deadline
Promulgation of Standard Sep. 21, 2006
Effective Date of Standard Dec. 18, 2006
State Recommendations to EPA 1 year after new standard
– Dec. 18, 2007 (based on 2004 - 2006 monitoring data)
Final Designations Signature 2 years after new standard
– Dec. 22, 2008 (based on 2005 - 2007 monitoring data). This notice never became effective and was reviewed by the new Administration.
– October 8, 2009 (based on 2006 - 2008 monitoring data) Published November 13, 2009
Effective Date of Designations 30 days after publication in the Federal Register
– December 14, 2009
SIPs Due 3 years after effective date of designations
– December 14, 2012
Attainment Date No later than 5 years after effective date of designations
– December 14, 2014
Attainment Date with Extension No later than 10 years from effective date of designations
– December 14, 2019

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