The Copenhagen Amendment was adopted in 1992 at the Fourth Meeting of the Parties to the Montreal Protocol held in Copenhagen. The amendment introduced control measures for consumption only for HCFCs (Annex C, Group I substances). The amendment further introduced control measures for both production and consumption for two new groups of substances, namely HBFCs (Annex C, Group II substances) and Methyl Bromide (Annex E, Group I).

The Copenhagen Amendment entered into force on 14 June1994