Smoke from hundreds of wildfires burning in Canada has prompted air quality warnings across parts of the United States on Friday.
More than 800 wildfires are burning across Canada and the clouds of dense smoke have spread south, choking major cities including Detroit, Chicago, and New York.More than 800 wildfires burning across CanadaTo view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video
Cities record 'hazardous' air quality readings
Both Detroit and Chicago issued air quality index readings in the "hazardous" range, while in New York, the metro area was shrouded in a smoke tinted haze, deemed unhealthy for sensitive groups.
National Weather Service (NWS) forecasts have warned that conditions may worsen overnight into Saturday morning.
