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Les concentrations médianes de dichlorométhane dans l'air en 2001 étaient inférieures à 0,5 µg/m³ dans la majorité des zones urbaines (Calgary, Edmonton, Regina, Windsor, Sarnia, London, Kitchener, Hamilton, Peterborough, Ottawa, Saint John et St. John's); elles se situaient entre 0,5 et 1 µg/m³ à Vancouver, Winnipeg, Oakville, Toronto et Montréal, et entre 1,5 et 2 µg/m³ à Kingston.
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Canadians can be exposed to dichloromethane through its presence in air, food and drinking water, as well as through the use of specific consumer products or in occupational settings. Exposure is more frequently associated with air and consumer products. Because dichloromethane is highly volatile, its presence in water is usually associated with groundwater sources. Dichloromethane is not frequently found in Canadian drinking water supplies. However, when present in drinking water, it may be absorbed through ingestion, inhalation and skin absorption.
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