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.

Wildfire smoke from Canada is expected to move over the U.S., impacting air quality for millions of people on Friday and this weekend.  Maps and satellite imagery show the large-scale impact of the blazes.

The heavy smoke from the active wildfires in Canada is expected to hit parts of the United States. Rising heat, winds, and dry air sparked blazes in the Canadian provinces of Saskatchewan and Manitoba,