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Weymouth v. Massachusetts Department of Environmental Protection

The First Circuit vacated an air permit issued by the Massachusetts Department of Environmental Protection (MDEP) for a proposed natural gas compressor station that is part of a natural gas pipeline connecting the northeastern U.S. and...

Environmental Protection Commission of Hillsborough County v. Volkswagen Group of America, Inc.

The Ninth Circuit affirmed in part and reversed in part a district court's dismissal of a suit challenging an automobile company's use of diesel-cheat devices to evade compliance with federally mandated emission standards. Two counties...

Environmental Integrity Project v. United States Environmental Protection Agency

The Fifth Circuit upheld EPA's decision to reject a challenge to a CAA Title V permit it issued for expansion of a plant in Baytown, Texas. Environmental groups requested that EPA reject the permit on the grounds that the underlying...

Maryland v. Environmental Protection Agency

The D.C. Circuit granted in part and denied in part Delaware's and Maryland's challenges to EPA's denial of their CAA §126(b) petitions requesting that the Agency impose additional limitations on certain upwind sources contributing to...

Louisiana Environmental Action Network v. Environmental Protection Agency

The D.C. Circuit granted a petition to review EPA's 2017 rule revising its emission standard for hazardous air pollutants (HAPs) emitted from pulp mill combustion sources. Environmental groups argued that EPA was required under §112(d)(...

Sierra Club v. Wheeler

The D.C. Circuit affirmed dismissal of an environmental group's request to compel EPA to produce guidelines for commercial or industrial solid waste incinerators (CISWI) and other categories of solid waste incinerators (OSWI). The group...

Sierra Club v. Environmental Protection Agency

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...

Natural Resources Defense Council v. Wheeler

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...

Wheelabrator Baltimore, L.P. v. Mayor and City Council of Baltimore

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...

Renewable Fuels Ass'n v. United States Environmental Protection Agency

The Tenth Circuit vacated EPA orders that granted extensions of exemptions under the CAA's renewable fuels program for three small refineries. Industry groups challenged the orders, arguing that EPA failed to honor the statutory...

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