Heavy, acrid wildfire smoke blanketed much of the eastern United States on Saturday, marring preparations for the weekend's highly awaited World Cup final to be held in an open stadium in New Jersey.

Wildfire smoke from Ontario has severely degraded air quality across the northeastern United States. Chicago recorded "Very Unhealthy" levels of fine particulate pollution on…

Smoke from Canadian wildfires has placed a haze upon New York City, Toronto, and several other major metropolitan areas.

Authorities issue health warnings after smoke from wildfires in Canada envelops north-eastern US

The Northeast is experiencing unhealthy air quality due to Canadian wildfires as Sunday’s World Cup final in New Jersey approaches.