According to a ranking by IQ Air, a Swiss air-technology company, Chicago had the worst air quality in the world for a few ...

Most of the Chicago area remains under an Air Quality Alert on Saturday due to smoke from Canadian wildfires. The alert was, at one point, set to expire late Friday night for most of the area, but it ...

Smoke from Canadian wildfires hovered over several Midwestern states Saturday, bringing warnings of unhealthy air for at ...