Americans in at least 10 states in the Upper Midwest and Northeast are under air quality alerts stemming from Canadian wildfires funneling smoke into the United States. It comes as millions across the South and Southwest face even more sweltering heat.

Under a Code Orange alert, it's recommended that children, older adults and those with respiratory illnesses limit time spent outdoors.

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