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A big swath of the U.S. is under red and purple air quality alerts from Canada's smoke

Pittsburgh's Duquesne Incline ascends Mount Washington as smoke, from Canadian wildfires, hanging over the U.S. Midwest and parts of the East Coast create hazy skies on Wednesday. (Reuters)
Pittsburgh's Duquesne Incline ascends Mount Washington as smoke, from Canadian wildfires, hanging over the U.S. Midwest and parts of the East Coast create hazy skies on Wednesday. (Reuters)

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