The Beijing Amendment was adopted in 1999 at the eleventh Meeting of the Parties to the Montreal Protocol held in Beijing. The amendment introduced control measures for production for HCFCs (Annex C, Group I substances) and imposed restrictions on trade with non-Parties for these HCFCs. The amendment further introduced control measures for both production and consumption for one new group of substances, namely Bromochloromethane or BCM (Annex C, Group III substance).

The Montreal Amendment entered into force on 10 November 1999.