A coalition of energy companies and business groups petitioned Chief Justice John Roberts for extra time to weigh whether or not to appeal a lower court's decision that largely upheld the Environmental Protection Agency's ("EPA") 2015 ozone caps. In August, the U.S. Court of Appeals for the District of Columbia upheld the Obama administration's primary ozone standard of 70 ppb, which industry representatives maintain is too stringent. The industry challenge focused on two arguments: (1) that pollution standards should be looser to account for "background ozone" from natural sources; and (2) that the EPA should have considered "adverse economic, social, and energy impacts" when crafting the more stringent standard. The petitioners have asked for an extension until January 17 to file a Supreme Court petition to rehear the case.

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