EPA is approving portions of a State Implementation Plan (SIP)  revision submitted by the State of Oregon on December 20, 2010, as meeting the requirements of Clean Air Act (CAA) section 110(a)(2)(D)(i)(II) as it applies to visibility for the 1997 8-hour ozone and 1997 particulate matter (PM2.5) National Ambient Air Quality Standards (NAAQS). EPA is also approving portions of the revision as meeting certain requirements of the regional haze program, including the requirements for best available retrofit technology (BART).

DATES:  Effective Date: This final rule is effective August 4, 2011.