In December 2020, Congress passed the American Innovation and Manufacturing (AIM) Act, which gave the Environmental Protection Agency (EPA) the authority to phase down HFCs to 15% of their baseline levels by 2036. It was up to the EPA to decide how to implement the legislation.

In September 2021, the organization delivered its final rule, which established the HFC baseline, as well as the phasedown schedule, and an initial methodology for issuing allowances for 2022 and 2023. Further guidance came in October 2021, when EPA released the 2022 allowances for companies that produced and/or imported HFCs in the U.S.