EPA's Mid-Term Evaluation of Vehicle Greenhouse Gas Emissions Standards [March 29, 2017] [open pdf - 132KB]
"In 2009, the Obama Administration-through authorities provided to the National Highway Traffic Safety Administration (NHTSA) and the Environmental Protection Agency (EPA)-developed joint standards for fuel economy and greenhouse gas (GHG) emissions for new light-duty vehicles (defined generally as passenger cars and light trucks). The standards (referred to as the One National Program) were established in two phases: Phase 1 for vehicle model years (MY) 2012-2016, finalized on May 7, 2010; and Phase 2 for MY2017-2025, finalized on October 15, 2012. The agencies promulgated the joint rulemakings with the support of an array of stakeholders-including auto manufacturers, labor unions, the environmental community, the state of California, and other states-and intended them to provide industry with a single regulatory voice (to avoid conflicting regulations within the federal government and among the states) and a long-term regime (to provide greater certainty for product planning and engineering)."
CRS Insight, IN10619
Federation of American Scientists: http://www.fas.org/sgp/crs/index.html