"Wildfire Smoke Blankets Midwest, Triggering Air Quality Alert in Chicago"

Chicago is experiencing "very unhealthy" air quality levels due to smoke from Canadian wildfires, prompting an air quality alert and urging the public to reduce emissions and limit outdoor activity. The city had the worst air quality out of 95 cities worldwide on Tuesday. Thunderstorms are expected with hail and strong winds, but temperatures will remain in the mid-70s. Emergency rooms have seen an increase in patients with symptoms related to the wildfire smoke.