D.C. Circuit Vacates Rule Regulating Hydrofluorocarbons Under The Clean Air Act
Section 612 of the Clean Air Act (“CAA”) requires that manufacturers replace substances that have been determined to deplete the stratospheric ozone layer with alternatives that do not have the same effect. Section 612 further directs EPA to develop a list of safe substitutes and a list of prohibited substitutes. Hydrofluorocarbons (“HFCs”) were on the safe substitutes list until 2015, when EPA moved many of them to the prohibited substitutes list. EPA asserted that this change required manufacturers who had been using HFCs to replace them with other substances from the safe list. The 2015 Rule was challenged, and on August 8, 2017, in Mexichem Fluor Inc. et al., v. U.S. Environmental Protection Agency, No. 15-1328, the D.C. Circuit vacated the 2015 Rule to the extent that it required manufacturers to cease using HFCs as a replacement for ozone-depleting substances.