International Day for the Preservation of the Ozone Layer of the hole in the ozone layer was observed 30 years after the protocol was signed. Due to the nature of the gases responsible for ozone depletion their chemical effects are expected to continue for between 50 to 100 years. International Day for the Preservation of the Ozone Layer September 16 was designated by the United Nations General Assembly as the International Day for the Preservation of the Ozone Layer. This designation had been made on December 19, 2000, in commemoration of the date, in 1987, on which nations signed the Montreal Protocol on Substances that Deplete the Ozone Layer.
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