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Wildfire smoke from Canada has caused a significant air quality alert in Minnesota, impacting the entire state through Saturday. Minneapolis had the world's second-worst air quality on Friday morning, with an AQI of 159, deemed unhealthy for everyone. Other Minnesota cities also experienced extremely poor air quality. The situation is expected to improve as winds shift on Saturday, but clearing could be slow. The Minnesota Pollution Control Agency issued the alert, advising residents to be cautious.

Prepared by Olivia Bennett and reviewed by editorial team.