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In 2024, EPA issued the final Review of the Residual Risk and Technology Review for MATS that updated certain standards for coal- and oil-fired electric utility steam generating units (EGUs). Specifically, the rule updated the filterable particulate matter standard (surrogate for the non-mercury hazardous air pollutant metals) for existing coal-fired EGUs, the mercury standard for lignite coal-fired EGUs, and revised the particulate matter compliance demonstration requirements to only allow particulate matter continuous emission monitoring systems. EPA is now undertaking a new rulemaking to repeal this action in accordance with Executive Order 14192, "Unleashing Prosperity Through Deregulation" (90 FR 9065, February 6, 2025) and Executive Order 14154, "Unleashing American Energy" (90 FR 8353, January 29, 2025).