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Story summary
- A heat wave and wildfire-smoke episode forced heat warnings and air-quality alerts across Minnesota.
- An extreme heat warning remains through Thursday with heat indexes near 100 °F.
- Governor Tim Walz declared a peacetime emergency and mobilized the National Guard for wildfire suppression.
- The Minnesota Pollution Control Agency issued air-quality alerts for Minnesota communities as smoke from Arrowhead and Canadian fires drifts, while Chicago recorded 96 °F with an alert through Wednesday night.
