Major industry groups are praising EPA's draft guidance narrowing when the agency will “aggregate” pollution sources as one source for new source review (NSR) permitting purposes, but are urging EPA to further reduce the scope of aggregation by creating a more-limited definition of when sources are deemed “adjacent” for NSR.

Sierra Club is attacking EPA's landmark denial of the group's petition asking it to object to a Utah-issued Clean Air Act permit for a coal-fired power plant, claiming the decision unlawfully reverses national air permitting policy by excluding consideration of underlying permit conditions in assessing the merits of air law “Title V” air permits.

A three-judge appellate panel at Oct. 3 oral argument asked tough questions of all sides in litigation over the Obama EPA's “update” to its Cross-State Air Pollution Rule (CSAPR), including what authority the agency has to craft interstate air pollution rules that fail to guarantee states will attain federal air standards by statutory deadlines.

The Department of Justice (DOJ) is planning to renew its call for the Supreme Court to halt a novel climate change case brought by 21 youth plaintiffs, just weeks before the long-pending and high-profile matter is scheduled to go to trail in a federal district court in Oregon.

EPA has finalized a rule that weakens an Obama-era national emissions standards for hazardous air pollutants (NESHAP) rule for amino-phenolic resins manufacturing and is also delaying implementation of the softened rule, in response to petitions from resin products urging the Trump administration to revise the regulation.

Appellate judges at oral argument in two related suits over EPA's renewable fuel standard (RFS) appeared to be searching for ways to review refiners' long-running claims that the agency's compliance “point of obligation” is unfair, querying EPA on whether it has attempted to unlawfully shield the obligation point from judicial review.

EPA's claims that it can rely on state programs to limit methane leaks at oil and gas operations in lieu of federal rules are drawing fire from environmentalists who say that EPA's analysis for its methane rule rollback proposal fails to quantify the pollution cuts -- or lack thereof -- from the state programs.

The Supreme Court is letting stand an appellate decision that largely vacated EPA's rules restricting the use of refrigerant chemicals that act as potent greenhouse gases, rejecting without comment petitions from environmentalists and some chemical companies that support alternative substances that are less damaging to the climate.