(a) EPA approves the portion of Oregon's SIP revision submitted June 23, 2010, and December 22, 2010 (referenced in Sec. 52.1989(a)) addressing the requirement in Clean Air Act section 110(a)(2)(D)(i)(II) that a state not interfere with any other state's required measures to prevent significant deterioration (PSD) of its air quality (the third PSD element).
(b) The EPA approves the portion of Oregon's SIP submitted on June 28, 2010 (cover letter dated June 23, 2010) addressing the requirements of CAA section 110(a)(2)(D)(i)(I) for the 2006 24-hour PM2.5 NAAQS. [76 FR 80754, Dec. 27, 2011, as amended at 80 FR 2315, Jan. 16, 2015]