Weather tracker: Toronto and New York ranked most polluted from Canada wildfires

During a period in which more than 500 wildfires have been raging across Canadian provinces, spreading an orange-brown haze across eastern Canada, as well as the Midwest and Northeast regions of the US, major North American cities like Toronto and New York have been ranked as the most polluted urban areas in the world.

Weather tracker: Toronto and New York ranked most polluted from Canada wildfires

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