Where the wildfire smoke from Canada is blowing, and how dangerous it is
Hot summer days are getting stuffier for more than 100 million people in the U.S. as wildfire smoke drifts south and imposes dangerous risks to their health.
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Hundreds of wildfires burning in Canada have created a thick wave of smoke that’s shrouding swaths of the U.S. from Milwaukee to Washington, D.C., in unhealthy air.
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As of Thursday, more than 800 wildfires are actively burning across Canada, with large clusters in Ontario near the border with Minnesota. A heat wave across North America is trapping the unhealthy air and carrying it south.
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