EPA is seeking comments on a draft policy assessment titled “Policy Assessment for the Review of the Secondary National Ambient Air Quality Standards for NOx and SOx: Second External Review Draft.” 75 Fed. Reg. 57,463 (9/21/10). The draft assessment is part of the agency’s periodic review of national ambient air quality standards (NAAQS) for oxides of nitrogen and sulfur. EPA plans to propose a revised secondary standard for oxides of nitrogen and sulfur in July 2011 with a final rule projected by March 2012. EPA will accept comments on the draft assessment until November 12, 2010.