On April 30, 2021, the US Environmental Protection Agency (EPA) proposed rules to phase down production and consumption of specified hydrochlorofluorocarbons (HFCs), consistent with directives included in the 2016 Kigali Amendment to the United Nations-sponsored Montreal Protocol on Substances that Deplete the Ozone Layer. These rules were authorized by the massive coronavirus relief bill (American Innovation and Manufacturing Act of 2020 (AIM Act)) enacted in December 2020, which included dozens of unrelated provisions within its 5,593 pages.