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A thick plume of smoke swept across the Midwest and New England, and those conditions could linger on Friday.
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Smoke from more than 800 blazes has filled major cities from Toronto and New York, to parts of the US Midwest and Great Lakes.
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The haze is likely to ease in the East this weekend but linger in the Upper Midwest, where some cities recorded extremely high pollution indexes on Thursday.
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Officials in New York and New Jersey issue an air quality health alert because of wildfire smoke just days before the World Cup final.
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