Air quality in major cities across the Midwest, including Minneapolis and Chicago, has plummeted due to smoke from ongoing Canadian wildfires. Minneapolis ranked 2nd worst in the world for air quality on Friday, while Chicago saw its air quality drop to alarming levels during the Lollapalooza music festival. Alerts have been extended in various regions, including Illinois, Minnesota, and Michigan, impacting millions and prompting health advisories. Authorities are urging residents to monitor their health for symptoms like coughing and dizziness as smoky conditions persist. Despite some areas experiencing temporary sunshine, the wildfire smoke is expected to linger, with air quality forecasts indicating further deterioration before improvement.