Canadian wildfire smoke turns air hazardous in the US Midwest. Officials say stay inside

Canadian wildfire smoke turns air hazardous in the US Midwest. Officials say stay inside
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Heavy, pungent smoke from Canadian wildfires darkened skies in the U.S. on Thursday from the Great Lakes to parts of the East Coast, reducing visibility and prompting warnings that breathing the air outside could be dangerous.Officials in many cities urged residents to stay inside or wear masks o...