Environment Canada's air quality index has reported moderate to high risk since Saturday morning in Calgary, as many parts of the country struggle with the effects of wildfire smoke.

Smoke from Canadian wildfires is engulfing much of the eastern and central United States and and is expected to continue for days.

Smoke from Canadian wildfires began to worsen air quality in the eastern U.S. on Wednesday as several Midwestern states continued to battle conditions seemed unhealthy by the federal government