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Clean Air Act (CAA)

Sierra Club v. EPA

The D.C. Circuit held that EPA did not violate the CAA by modifying, without notice and comment, its prior understandings of how to measure a proposed transportation project’s impact on ambient levels of particulate matter. In 2006, EPA...

Center for Biological Diversity v. EPA

A district court ordered EPA to issue infrastructure requirements for the 2012 fine particulate matter NAAQS for five states within 90 days. In 2015, New Jersey, Pennsylvania, Washington, Illinois, Massachusetts, and Rhode Island missed...

Natl. Parks Conserv. Assn. v. EPA

A district court denied EPA's request to amend a 2012 consent decree obligating the Agency to approve state regional haze plans. In 2011, environmental groups sued the Agency to compel it to take action on nine states' regional haze...

Sierra Club v. North Dakota

The Ninth Circuit upheld a 2014 EPA settlement that required the Agency to set a phased schedule for it to issue air quality designations as required by a 2010 sulfur dioxide NAAQS. In 2013, when EPA missed the statutory deadline to...

Sinclair Wyoming Refining Co. v. EPA

The Tenth Circuit rejected EPA's decision to deny an oil company's request for an exemption from the blending requirement under the Renewable Fuel Standards Program of the CAA. In 2005, Congress amended the CAA to require refiners and...

Mexichem Fluor, Inc. v. EPA

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 of products containing HFCs. EPA based...

Sierra Club v. EPA

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 2015, the Agency claimed to have...

Clean Air Council v. Pruitt

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 and fix leaking methane. The measure...

Murray Energy Corp. v. EPA

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 employment before implementing regulations. In...

Arizona v. EPA

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, Arizona submitted a SIP to EPA for approval...

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