Draft Documents Related to the Review of the National Ambient Air Quality Standards for Particulate Matter

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The EPA is announcing an extension of the public comment period for two draft assessment documents titled, Risk Assessment to Support the Review of the PM Primary National Ambient Air Quality Standards--External Review Draft and Particulate Matter Urban-Focused Visibility Assessment--External Review Draft (74 FR 46589; September 10, 2009). The EPA is extending the comment period that originally was scheduled to end on October 15, 2009. The extended comment period will close on November 9, 2009. The EPA is extending the comment period to provide stakeholders and the public with adequate time to conduct appropriate analysis and prepare meaningful comments.