A Newsweek map shows where smoke from hundreds of wildfires burning across Canada which have prompted mass evacuations could impact states in the U.S. Smoke and airborne pollutants can be especially hazardous for individuals with respiratory conditions.

Authorities in Manitoba, which shares a border with the U.S., issued a state of emergency. Winds will likely blow wildfire smoke into Midwestern states.

Massive wildfires burning out of control in western and central Canada are forcing thousands to flee. The blazes are also sending hazardous smoke toward major cities in the United States.