(a) On June 23, 2010 and December 22, 2010, the Oregon Department of Environmental Quality submitted a SIP revision, adopted by the Oregon Environmental Quality Commission on April 30, 2010, to meet the requirements of Clean Air Act section 110(a)(2)(D)(i). EPA approves the portion of this submittal relating to significant contribution to nonattainment of the NAAQS in any other state and interference with maintenance of the NAAQS by any other state. EPA also approves the portion of the submittal 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) On December 20, 2010, the Oregon Department of Environmental Quality submitted a Regional Haze SIP revision, adopted by the Oregon Environmental Quality Commission on December 9, 2010. EPA approves the portion of this submittal relating to section 110(a)(2)(D)(i)(II) as it applies to visibility for the 1997 8-hour ozone NAAQS and 1997 PM2.5 NAAQS. The SIP revision also meets the requirements of Clean Air Act section 169A and 40 CFR 51.308(e) regarding Best Available Retrofit Technology and the requirements of 40 CFR 51.308(d)(2) and (d)(4)(v) regarding the calculation of baseline and natural conditions for the Mt. Hood Wilderness Area, Mt. Jefferson Wilderness Area, Mt Washington Wilderness Area, Kalmiopsis Wilderness Area, Mountain Lakes Wilderness Area, Gearhart Mountain Wilderness Area, Crater Lake National Park, Diamond Peak Wilderness Area, Three Sisters Wilderness Area, Strawberry Mountain Wilderness Area, Eagle Cap Wilderness Area, and Hells Canyon Wilderness Area, and the statewide inventory of emissions of pollutants that are reasonably anticipated to cause or contribute to visibility impairment in any mandatory Class I Federal Area. [76 FR 33651, June 9, 2011, as amended at 76 FR 39005, July 5, 2011; 76 FR 80754, Dec. 27, 2011]