EPA is proposing to approve submissions from Alabama for including revisions to the state implementation plan (SIP). The revisions pertain to the Clean Air Act (CAA) requirements for the 1997 annual and 2006 24-hour fine particulate matter (PM2.5) National Ambient Air Quality Standards (NAAQS). Specifically, the revisions will address the requirements to protect visibility in another nearby state as the requirements relate to PM2.5.
For more information, visit Federal Register Doc. 2013-03841 or
http://www.gpo.gov/fdsys/pkg/FR-2013-02-20/html/2013-03841.htm