Smoke from wildfires in Canada has left a thick haze over New York City and much of the U.S. East Coast. The city’s air quality was the worst in the world on Wednesday afternoon, according to tracking service IQAir.com. The view of Manhattan’s skyline from New Jersey almost disappeared behind the smoke. The smoke has triggered health concerns and officials warned people to limit activities outdoors. Many schools cancelled outdoor sports practices and recess. "This is not the day to train for a m

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