In Montréal, as in many large cities, factories are located alongside residential areas, increasing the risks in the event of a major industrial accident. This is why the city works closely with factories that use dangerous substances in order to reduce the risks associated with a major industrial accident involving toxic gas.
If this type of accident should occur, the population at risk would be alerted immediately with an alert siren. On the island of Montréal, there are four industrial sites with sirens:
Suncor Montreal sulfur plant, Cepsa Chimie Montréal, Saputo, Labatt Breweries of Canada and Molson Coors. The siren emits a modulating (rising and falling) tone for three minutes. To hear the siren, play the file below: