https://doi.org/10.1351/goldbook.14863
Officially the Protocol on Substances That Deplete the Ozone Layer, a treaty signed on 16 September 1987, in Montreal by 25 nations; there are now 168 subscribing nations. The protocol sets limits on the production of chlorofluorocarbons (CFCs), halons, and related substances that release chlorine or bromine to the ozone layer of the atmosphere.