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Midwest sees world's worst air quality as wildfire smoke spreads

Waterloo Region’s air quality among world’s worst

Air quality deteriorating as wildfire smoke moves into region

Wildfire smoke covers DC as officials warn of health risks

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Canadian wildfire smoke affecting air quality conditions in U.S.

Canada Wildfire Smoke Blankets US Cities, Air Quality Dips

Orange skies over parts of US and Canada engulfed in wildfire smoke

Toronto is choking: Wildfire smoke has created the world's worst air quality

Wildfire smoke brings world's worst air quality to Toronto

Chicago battling high heat, poor air quality

Canadian wildfire smoke in in Ontario, Minnesota triggers high risk air alerts

Wildfire smoke covers DC as officials warn of health risks

DC air quality reaches severely polluted levels from Canadian wildfire smoke