Air quality across the Midwest and parts of the East Coast has reached alarming levels due to smoke from ongoing wildfires in Canada. Chicago has been ranked as having the worst air quality in the world, with alerts extending through Friday amid major events such as Lollapalooza. Similar alerts have been issued for the entire state of Illinois, as well as regions in Iowa, Michigan, and New York. Residents in these areas are advised to limit outdoor activities due to the unhealthy air conditions, with heavy smoke contributing to hazardous air quality. Efforts to mitigate the situation are ongoing, but the impact of the wildfires on air quality is expected to persist.