The Tenth Circuit upheld an EPA rule in which it rejected Oklahoma's regional haze plan to limit sulfur dioxide emissions at electric utility power plants and replaced it with its own more stringent regulations via a federal implementation plan (FIP). Petitioners—the state of Oklahoma, the utility...

The Tenth Circuit affirmed an EPA order denying an environmental group's petition to object to a CAA Title V operating permit for a coal-fired power station in Colorado. In its petition for an objection, the group argued that the permit needed to include a plan to bring the power station into compli...