The alert, which goes into effect at midnight. comes as the Chicago area continues to see poor air quality due to the Canadian wildfires.

The "unhealthy" air, which ranks as level four of six on the Air Quality Index, comes after multiple consecutive days of air quality alerts.

Health officials from Minnesota to Maine have issued alerts warning of poor air quality from wildfires burning in Canada.

The National Weather Service issued an air quality alert for the city on Thursday and kept extending it through Sunday night. There was no alert Monday.

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Smoke from more than 700 active wildfires in Canada is once again clouding skies and pushing air quality into dangerous ...

Over 1,000 firefighters continue to battle a wildfire in Southern California that has scorched over 65,000 acres, prompted ...

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Smoke from Canadian wildfires has drifted into the Midwest and northeastern US, causing hazy skies and prompting air quality ...