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Fight Over Ozone Limits Set for December Argument

Sept. 25, 2018, 8:04 PM

A federal appeals court is nudging ahead a lawsuit over national ozone standards even after the EPA announced it wouldn’t revisit the 70 parts per billion limits that it set in 2015.

The U.S. Court of Appeals for the District of Columbia Circuit will hear oral arguments Dec. 18 from Murray Energy Corp. the nation’s largest underground mining company. In addition, separate coalitions representing states, businesses, manufacturers, and environmental groups will argue before the court.

Ground-level ozone forms when volatile organic compounds and nitrogen oxides—emitted by burning of fossil fuels—react in the presence of sunlight. Even at low ...