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

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

The smoke floating over the border shared between America and Canada is now impacting air quality in states as far south as Texas, AirNow's data shows. The EPA has declared the air quality in states near the Canadian border as "unhealthy or "unhealthy for sensitive groups."