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 for commuters and prompting warnings that air quality could make being outside dangerous.Detroit's air quality was among the worst in the world ...