Smoke from extensive wildfires in the Canadian Prairies has caused widespread air quality warnings across Canada and the United States. The wildfire smoke has led to unhealthy air conditions in large parts of the U.S. Midwest, including cities such as Minneapolis and Chicago, which have been ranked among the world's most polluted cities due to the smoke. The affected areas extend from the Midwest to the northeastern U.S. and Toronto. Health experts have highlighted the public health risks posed by the poor air quality resulting from the wildfire smoke, advising residents on protective measures. The situation has prompted official statements and special air-quality warnings across Canadian provinces and U.S. states impacted by the smoke.