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
Montreal flood of 1987 of God". In 1988, all the cities on the Island of Montreal, regrouped into the Montreal Urban Community, set up a common "Emergencies Coordination Bureau" ("Bureau des mesures d'urgence"). In 1997, the bureau was renamed "Centre de sécurité civile". Following the Municipal reorganization in Quebec in 2002, most of the cities were regrouped into the greater Montreal and the center became the "Centre de sécurité civile de Montréal". Montreal flood of 1987 The Montreal flood of 1987 happened on July 14 of that year when a series of strong thunderstorms crossed the island of Montreal, Canada, between the noon hour