Chicago and surrounding areas are under an air quality alert until midnight, weather officials said.

Smoke from wildfires in Manitoba, a Western province facing its worst fire season in 30 years, has created hazardous air quality conditions across Eastern Canada and the United States.

On July 15, officials issued an air quality advisory for these seven southeast counties: Livingston, Macomb, Monroe, Oakland, St. Clair, Washtenaw and Wayne.