The D.C. Circuit vacated a 2018 EPA rule that instituted a complete vacatur of its 2015 rule blocking the use of hydrofluorocarbons as replacements for ozone-depleting substances. An environmental group argued the 2018 rule was invalid because it was a legislative rule and was thus improperly promul...

The D.C. Circuit dismissed a petition to review EPA's Guidance on Significant Impact Levels (SILs) for Ozone and Fine Particles in the Prevention of Significant Deterioration Permitting Program, which sets numerical SILs that can be used by companies applying for PSD permits. An environmental group ...

A district court stayed an environmental group's climate change lawsuit against an oil company concerning a CWA permit for its petroleum storage facility in Massachusetts. The group argued that the permit required the company to consider predictable weather patterns, including flooding and severe st...

A district court granted two Baltimore solid waste incineration facilities' partial motion for summary judgment in a challenge to the Baltimore Clean Air Act (BCAA). The facilities argued the BCAA was "conflict preempted" by Maryland law because it prohibited solid waste incinerators from operating ...