Revisions to the Arizona State Implementation Plan, Arizona Department of Environmental Quality

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EPA is finalizing approval of revisions to the Arizona Department of Environmental Quality (ADEQ) portion of the Arizona State Implementation Plan (SIP). These revisions were proposed in the Federal Register on May 11, 2001 and concern affirmative defenses for excess emissions from sources regulated under the Clean Air Act as amended in 1990 (CAA or the Act).