Approval and Promulgation of Air Quality Implementation Plan; Oregon

EPA is taking direct final action approving most but not all of the State Implementation Plan (SIP) revisions submitted by the State of Oregon. This rulemaking evaluates the provisions of the Oregon Visibility SIP submitted August 26, 1993, smoke management plan provisions submitted on August 26, 1993, amendments to the smoke management plan for the Blue Mountains submitted September 27, 1995, and revisions to the Oregon field burning program submitted July 3, 1997. We are acting on these submissions together because they address, or are affected by, the control of particulate matter from area sources, specifically smoke from field burning and smoke from forestry burning. These rules are also linked through the Oregon Visibility SIP, which seeks to control visibility degradation through field burning programs and smoke management programs. EPA is taking no action on the provision in the visibility SIP changing the review period from three to five years. Instead, the original three year review cycle will remain in the federally approved SIP until the first Regional Haze SIP is submitted and approved.