D.C. Circuit Judges Appear Skeptical Of EPA Authority Over Trailer GHGs

September 15, 2020
A three-judge panel of the U.S. Court of Appeals for the District of Columbia Circuit appeared skeptical at Sept. 15 oral argument of EPA’s authority to limit greenhouse gases from long-haul trailers but did not seem to question if the Transportation Department could regulate the equipment’s fuel economy. The arguments thus could signal a split ruling in trailer makers’ challenge to 2016 GHG and fuel economy rules issued by EPA and the National Highway Traffic Safety Administration (NHTSA), even though...


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