Smoke from Canadian wildfires is causing poor air quality across the Midwest and East of the United States, with nearly a third of Americans experiencing unhealthy and dangerous conditions. Air-quality alerts were in effect for areas extending from Wisconsin to New York and the East Coast. Over 100 million Americans were urged to limit outdoor activities and wear masks if they have respiratory diseases. Major cities like New York, Chicago, and Philadelphia may experience murky skies and the smell of burning wood. Meanwhile, the US South is facing a brutal heatwave, with temperatures expected to reach as high as 46°C.

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