Industry groups and mainly GOP-led states suing EPA over its tougher, “reconsidered” limits for fine particulate matter (PM2.5) are again arguing that it lacked authority to revisit the Trump-era standard but also seeking to force cost considerations into all reviews of such standards, despite a landmark Supreme Court precedent. In their reply brief filed Sept. 30, industry petitioners in Commonwealth of Kentucky, et al., v. EPA renew their claim that the agency lacked statutory authority for its 2024 rule...