Smoke coming in from Canadian wildfires settled over Chicago, causing unhealthy air quality conditions for at-risk groups. The Environmental Protection Agency is set to send out another air quality alert for Saturday.

Wildfires are still raging in Canada, where there have been dozens of active fires, and over 33,000 people have been forced to evacuate their homes.

Illinois environmental officials are warning residents about air quality concerns as wildfire smoke from Canada persists in Chicago through Friday.