Mealey's (January 22, 2022, 10:55 AM EST) -- CINCINNATI — In an order issued Jan. 7, the Sixth Circuit U.S. Court of Appeals granted a motion by the state of Ohio to intervene in a challenge by Sierra Club and other environmental groups to a final rule issued by the U.S. Environmental Protection Agency that removed a state regulation that prohibits nuisance air pollution from Ohio’s state implementation plan (SIP); in the same ruling, the panel denied a motion by three trade associations to also weigh in on the case....