v>EPA Timeline of How We Got Here United States Environmental Protection Agency 1965 1970 1977 1990 1999 2003 2005 2007 2008 2009 2010 -< October Motor Vehicle Pollution Control Act established language that eventually became Clean Air Act (CAA) section 202(a)(1) December CAA established and provided authority to EPA August CAA is significantly amended including CAA section 202(a)(1) to include additional language November CAA is significantly amended October Petition for rulemaking to regulate for greenhouse gas (GHG) emissions from new motor vehicles (carbon dioxide, methane, nitrous oxide and hydrofluorocarbons) September EPA denies the 1999 petition for rulemaking July D.C. Circuit rules in favor of EPA's denial of the petition to regulate GHGs from new motor vehicles in Massachusetts v. EPA April Supreme Court reverses D.C. Circuit in Massachusetts v. EPA July EPA issues an advance notice of proposed rulemaking on regulating GHGs under CAA section 201(a)(1) December EPA finalizes the GHG Endangerment Finding for new motor vehicles under CAA section 202(a)(1) August EPA denies reconsideration of the 2009 GHG Endangerment Finding April EPA finalizes Interpretation of Regulations That Determine Pollutants Covered by Clean Air Act Permitting Programs (Triggering Rule) May EPA finalizes first GHG regulation for light-duty vehicles MYs 2012-2016 June EPA finalizes Prevention of Significant Deterioration and Title V Greenhouse Gas Tailoring Rule (Tailoring Rule) December EPA finalizes second GHG regulation for light-duty vehicles for MYs 2017 - 2025 EPA 420-F-26-005 February 2026 ------- v>EPA United States Environmental Protection Agency 2011 2014 2015 2016 2020 2021 2022 2024 2025 2026 September EPA finalizes Phase 1 GHG emission standards for medium- and heavy-duty vehicles and engines covering MYs 2014-2018 June Supreme Court in Utility Air Regulatory Group v. EPA, holds that the Tailoring Rule violated the CAA by reading the term "air pollutant" too broadly and regulating soruces Congress never intended it to regulate June Supreme Court in Michigan v. EPA, holds that EPA's power plant mercury rule illegally failed to consider the costs of regulation August EPA finalizes GHG Endangerment Finding for Airplanes under CAA section 231 October EPA finalizes Phase 2 GHG standards for medium- and heavy-duty vehicles and engines for MYs 2021-2027 April EPA finalizes revising GHG standards for MYs 2021 - 2026 to be less stringent in the Safer Affordable Fuel Efficient (SAFE) Vehicle Rule January EPA finalizes GHG standards for Airplanes December EPA finalizes revising existing GHG standards for cars and light-trucks through MY 2026 to be more stringent June Supreme Court in West Virginia v. EPA, holds that EPA's power plant GHG rule violated the CAA by illegally seeking to transform a sector of the economy away from fossil fuel April Denial of reconsideration of Endangerment Finding June Supreme Court in Loper Bright Enterprises v. Raimondo, holds that courts may no longer defer to agencies' statutory interpretation March EPA finalizes GHG and criteria pollutant rule for light- and medium-duty vehicles for MYs 2027 - 2032 and later April EPA finalizes Phase 3 GHGs for heavy-duty vehicles for MYs 2027 - 2032 August EPA proposes reconsideration of the 2009 Endangerment Finding and all GHG vehicle rules February EPA finalizes recission of the 2009 Endangerment Finding and all GHG vehicle rules EPA 420-F-26-005 February 2026 ------- |