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This final rule will contain EPA's final approach to the issues raised and revisions proposed in the Notice of Proposed Rulemaking of May 4, 2016. These issues and revisions include (1) a proposed change in the deadline for the submittal of the next comprehensive revision of each states' regional haze State Implementation Plan (SIP) from July 31, 2018 to July 31, 2021; (2) proposed changes to the timing, format, and required content of periodic progress reports; (3) proposed clarifications regarding the relationship between long-term strategies and reasonable progress goals; (4) proposed changes related to how days are selected for tracking progress; (5) proposed treatment of impacts on visibility from anthropogenic sources outside the U.S. and from wildland fires within the U.S.; (6) proposed changes to reasonably attributable visibility impairment provisions; and (7) proposed changes to federal land manager consultation requirements.