The D.C. Circuit reversed and vacated a portion of a January 2013 rule in which EPA revised the NESHAPs and new source performance standards for backup generators. Specifically, the court held that EPA acted arbitrarily and capriciously when it modified the NESHAPs and NSPS to allow backup generator...

The D.C. Circuit dismissed petitions challenging EPA's and the National Highway Traffic Safety Administration's (NHTSA's) coordinated rules governing the greenhouse gas emissions and fuel economy of cars and trucks. One group of petitioners—businesses, associations, and individuals located in Cali...