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The 10 appellate judges hearing oral arguments over EPA's power plant rule appeared skeptical of claims by opponents that the rule is unlawful because the agency already regulates power plants' air toxics emissions, but they grappled with arguments that the rule is unlawful because Congress has not spoken directly on the matter.

The Obama administration is urging House lawmakers to revise an Army Corps of Engineers' authorization bill by removing provisions that would create a “confusing and duplicative” mitigation bank, while also calling on Congress to quickly approve funding to support Flint, MI, as it tries to recover from a lead in drinking water crisis.

States and major industry groups are faulting what they say is EPA's misreading of the Clean Air Act when it issued a rule forcing 36 states to scrap air law waivers for certain facility operations, saying the agency's claim of “fundamental” flaws in the waivers to justify the rule is not tied to specific statutory language and is therefore unlawful.

Days before international talks to phase out high global warming potential (GWP) hydrofluorocarbons (HFCs), EPA has released its final rule phasing out a second round of the coolants, rejecting refrigeration industry requests to extend by as many as one to three years the deadlines by which companies must phase out some of the chemicals.

EPA is rejecting Idaho's human health water quality criteria for arsenic and small organisms after re-examining the state's standards as a result of a court-approved consent decree, marking a win for environmental groups who have challenged the agency's approval of several water quality criteria in the region.

WHEELING, WV -- EPA's top research official is vowing to launch a workshop in the remaining months of the Obama administration that will aim to assist state regulators as they grapple with complex risk analyses to inform their environmental policy decisions, such as the benefits and hazards of dredging contaminated sediment.

EPA is defending its authority for tightening its ozone national ambient air quality standards (NAAQS) below the levels of naturally occurring “background” ozone in some states, rejecting claims from some critics that the decision was unlawful while also fighting advocates' claim that the NAAQS should have been made even stricter.