A federal judge on Wednesday boosted California’s efforts to curb greenhouse gas emissions from tailpipes when he rejected auto industry arguments that such power rests solely with federal regulators, not individual states.

“The court concludes that both [the federal] EPA and California … are equally empowered through the Clean Air Act to promulgate regulations that limit the emission of greenhouse gasses, principally carbon dioxide, from motor vehicles,” wrote Eastern District of California Judge Anthony Ishii, of Fresno.