A district court ordered EPA to either promulgate revised emissions standards for the the pulp mill and nutritional yeast manufacturing source categories, or issue a determination that such standards are not required under the CAA. EPA promulgated emissions standards for both of these major source c...

The Tenth Circuit dismissed an environmental group's citizen suit against an Oklahoma power company for CAA violations at a power plant. The group claimed the company modified a coal-fired boiler without first obtaining an emission-regulating permit as required by the CAA. But because the group file...