Smoke from Canadian wildfires is causing air quality concerns for millions of Americans in the Midwest and Northeast.

As Canada grapples with one of its worst wildfire seasons on record, smoke from the blazes have prompted air quality alerts ...

Air quality alerts are in effect on Tuesday in 10 states as toxic smoke from hundreds of wildfires burning in Canada ...

Air quality will continue to improve tonight. Temperatures and humidity will continue to increase, peaking on Friday.

Air quality alerts have been issued across 12 states for Wednesday, according to the National Weather Service.

Air quality is expected to reach the orange AQI category in northeast Minnesota, which is unhealthy for sensitive groups.