Montreal Protocol (1973) and the international agreement signed (1985 & 1987). The treaty is structured around several groups of halogenated hydrocarbons that deplete stratospheric ozone. All of the ozone depleting substances controlled by the Montreal Protocol contain either chlorine or bromine (substances containing only fluorine do not harm the ozone layer). Some ozone-depleting substances (ODSs) are not yet controlled by the Montreal Protocol, including nitrous oxide (N2O) For a table of ozone-depleting substances controlled by the Montreal Protocol see: For each group of ODSs, the treaty provides a timetable on which the production of those substances must be shot out and eventually
UNEP OzonAction Multilateral Fund for the Implementation of the Montreal Protocol was set up. The Fund's "main objective is to assist developing country parties to the Montreal Protocol whose annual per capita consumption and production of ozone-depleting substances is less than 0.3 kg to comply with the control measures of the Protocol". UNEP’s OzonAction branch is one of the Fund’s implementing agencies, along with others, such as UNIDO, UNDP and the World Bank. Official website UNEP OzonAction OzonAction is a branch of the United Nations Environment Programme (UNEP) which has its main office in Paris, and is part of UNEP's Division of