Fluorinated gases pharmaceutical industries, as well as in refrigeration when combined with other gases. PFCs were commonly used as fire extinguishants in the past and are still found in older fire protection systems. They are also a by-product of the aluminium smelting process. Sulphur hexafluoride (SF) is used primarily as an insulation gas. It can be found in high-voltage switchgear and is used in the production of magnesium. HFCs were developed in the 1990s to substitute substances such as chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs). As these substances were found to deplete the ozone layer, the Montreal Protocol lays down provisions for them
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