The D.C. Circuit upheld amendments EPA made to its CAA regional consistency regulations that allow regional offices to act counter to national policies when ordered to do so by federal circuit…

The Tenth Circuit refused to stay pending interlocutory appeal a lower court order staying BLM's waste prevention rule, which was issued to reduce the venting, flaring, and leaking of natural…

A district court ordered EPA to promulgate revised CAA emission standards for nine industrial sectors by October 1, 2021. Environmental groups wanted the overdue rulemakings to be completed within…

The D.C. Circuit upheld EPA's 2012 regional haze rule, which seeks to restore air quality and visibility in certain national parks and wilderness areas to what they would be under natural…

The D.C. Circuit granted in part and denied in part petitions concerning EPA's NESHAPs for industrial boilers. The first challenge raised by environmental groups concerned regulations that…

The D.C. Circuit held that EPA unlawfully revoked the 1997 ozone NAAQS when it implemented the 2008 standard. In 2008, EPA set the ozone NAAQS at 75 parts per billion (ppb). In 2015, when…

A district court held that EPA failed to act when it did not rule within 60 days on Connecticut's petition concerning upwind pollution. In June 2016, Connecticut filed a petition pursuant to…

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…

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…

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…