Terms and Purposes
The treaty is structured around several groups of halogenated hydrocarbons that have been shown to play a role in ozone depletion. All of these ozone depleting substances contain either chlorine or bromine (substances containing only fluorine do not harm the ozone layer). For a table of ozone-depleting substances see:
For each group, including group ST, the treaty provides a timetable on which the production of those substances must be phased out and eventually eliminated.
Read more about this topic: Montreal Protocol
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