American Public Health Association v. EPA

West Virginia and other states filed a motion to intervene as respondents, arguing that they had a “direct and unique interest” in the proceedings due to the economic costs of the vehicle emissions standards and the questions raised regarding how climate-related matters should be addressed. They also argued that the federal respondents would not adequately represent their interests, including because they were “in a better position to counter anticipated arguments from other States about the consequences of the Final Rule and climate change for States themselves.”

Seventeen public health and environmental organizations filed the first lawsuit challenging the U.S. Environmental Protection Agency’s (EPA’s) final rule rescinding the 2009 greenhouse gas endangerment finding under the Clean Air Act and repealing all greenhouse gas emission standards for motor vehicles and engines for model years 2012 to 2027 and beyond.