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https://www.federalregister.gov/documents/2026/02/24/2026-03638/national-emission-standard…

…ion in §§ 63.10031(c)(5)(ii) and 63.10020(e) pertaining to startup and shutdown events, starting with a report for the first calendar quarter of 2024, if you have elected to use paragraph 2 of the definition of startup in § 63.10042 (see § 63.10031(i)). On or after January 2, 202…

https://www.federalregister.gov/documents/2026/03/17/2026-05167/national-emission-standard…

…and Oil-Fired Electric Utility Steam Generating Units: Final Repeal, 91 FR 9088 9099 (Feb. 24, 2026) (“2026 MATS Repeal”) (explaining that “the statutory benchmarks for risk provide relevant guidance on whether additional regulation is `necessary' under CAA section 112(d)(6)”). B…