The D.C. Circuit upheld EPA's decision to modify the criteria or lower the threshold by which the Agency determined whether to grant small refineries an exemption from the CAA's Renewable Fuel Program. An industry group argued that the increase in the number of exemptions granted in 2016 and 2017 co...

A district court granted in part a motion to stay its previous order requiring an electric utility company to obtain a PSD permit to address CAA violations at its coal-fired power plant in Festus, Missouri, and to install air pollution control technology at a neighboring plant in Labadie, Missouri. ...

The D.C. Circuit upheld EPA's decision to reconsider greenhouse gas emission standards for model year 2022-2025 vehicles. States and environmental groups argued that EPA violated procedural and substantive requirements imposed by the CAA and that the decision was arbitrary and capricious. The Agency...

The Fifth Circuit upheld EPA's approval of Louisiana's SIP for controlling regional haze. Environmental groups challenged the approval of Louisiana's selection of low-sulfur coal over a more effective pollutant control as the best available retrofit technology to curb emissions at a coal-fired power...

A district court ordered an electric utility company to obtain a PSD permit to address CAA violations at its coal-fired power plant in Festus, Missouri. EPA argued that the company increased the risk of negative health impacts and premature deaths by releasing excess tons of sulfur dioxide from its ...

The D.C. Circuit vacated EPA's 2018 update to the Cross-State Air Pollution Rule (CSAPR). States and environmental groups argued that EPA violated the CAA by failing to require upwind states to reduce their contribution of ozone precursors to downwind states in accordance with the deadline by which ...

The D.C. Circuit granted in part and denied in part a petition challenging EPA's update to the Cross-State Air Pollution Rule. Environmental groups and Delaware argued that EPA violated the CAA by failing to require upwind states to eliminate their significant contributions in accordance with the de...

The D.C. Circuit upheld EPA's implementation of its Renewable Fuel Standards Program, which requires transportation fuel sold in the United States to contain a minimum volume of renewable fuels. Some industry groups argued that EPA arbitrarily refused to revise its 2010 point of obligation rule that...

The D.C. Circuit dismissed a petition to review EPA's order denying an environmental group's objection to renewal of a Title V operating permit for a power plant in Utah. The group objected that the renewal permit incorporated requirements in a 1997 Title I preconstruction permit that was based on a...

The D.C. Circuit dismissed in part and denied in part a petition to review EPA's 2016 revisions to its ambient air quality monitoring system regulations. An environmental group argued that the revisions violated the CAA by not requiring states to give advance notice and hold a public hearing when ma...