Canada wildfires darken U.S. skies, trigger air quality alerts

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• CBS NewsLean L·2h ago

  Canada wildfires darken U.S. skies, trigger air quality alerts

  Hundreds of wildfires in Canada darkened skies in the U.S. on Wednesday. A big shift in the wind prompted air quality alerts in at least 16 states across the Midwest and Northeast. Tom Hanson reports.

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