The D.C. Circuit held that EPA overstepped its authority under the CAA when it banned the use of hydrofluorocarbons (HFCs) in products. In 2015, EPA issued a rule that restricted the manufacture…

A district court held that New York's Zero-Emission Credit (ZEC) program is not preempted by federal law. In an effort to curb the effects of global warming, New York issued a Clean Energy…

The D.C. Circuit held that EPA must justify emissions limits set for certain hazardous air pollutants. The CAA requires EPA to set limits for seven different hazardous air pollutants (HAPs). In…

The D.C. Circuit held that EPA must continue to enforce methane emissions regulations implemented by the previous administration. In 2016, an EPA regulation required oil and gas companies to find…

The Fourth Circuit held that it does not have jurisdiction to determine whether EPA violated the CAA when the agency failed to conduct continuing evaluations of potential loss or shifts of…

The Iowa Supreme Court held that neighbors of an Iowa corn processing plant were properly certified as a class to pursue pollution claims against the operator. The neighbors filed a suit under…

The D.C. Circuit vacated an EPA final rule that exempted farms from reporting requirements for air releases from animal waste. In 2008 the EPA issued a final rule that generally exempts farms from…

A California Appeals Court upheld a state cap-and-trade regime against challenges from the state commerce board and affected industry players. In 2006, California passed the California Global…

The Ninth Circuit upheld an EPA federal implementation plan (FIP) under the CAA that replaced rejected portions of the Arizona SIP concerning air quality at federal parks and forests. In 2011,…

A district court ordered EPA to complete overdue assessments of 13 sources of hazardous air pollutants. In 2016, environmental groups sued the Agency over a failure to meet CAA requirements that…