A district court dismissed an environmental group's CAA citizens suit against EPA for failing to make a finding that Idaho and Utah failed to timely submit SIPs for fine particulate matter (…

The court holds that the U.S. Environmental Protection Agency's (EPA's) approval of Georgia's state implementation plan (SIP) mooted environmental groups' claims that Atlanta…

The court grants an environmental group's motion for partial summary judgment against Pennsylvania officials for failing to implement the state-enhanced vehicle inspection and maintenance (I/…

The court largely upholds a U.S. Environmental Protection Agency (EPA) rule mandating that 22 states and the District of Columbia revise their state implementation plans (SIPs) to mitigate ozone…

The court grants automakers' motion to stay their challenge to Massachusetts' zero emission vehicle standards pending the automakers' appeal of a U.S. Environmental Protection…

The court holds unlawful U.S. Environmental Protection Agency (EPA) regulations that allow both local approval and federal funding of transportation projects that fail to satisfy the Clean Air Act…

The court holds that the Federal Aviation Administration's (FAA's) approval of the expansion of Burbank-Glendale-Pasadena Airport does not violate the National Environmental Policy Act (…

The court denies a petition challenging the U.S. Environmental Protection Agency's (EPA's) decision to grant a nitrogen oxide (NOx) reduction requirement exemption to four states…

The court holds that the Massachusetts Department of Environmental Protection's (DEP's) zero emission vehicle (ZEV) regulations for automobile manufacturers are not identical to…