Smoke from wildfires in Manitoba, a Western province facing its worst fire season in 30 years, has created hazardous air quality conditions across Eastern Canada and the United States.

Environment Canada urges residents to limit their time outdoors. But even when inside, most buildings can only reduce airborne pollutants by half.

A haze of wildfire smoke engulfed Toronto on Monday morning, pushing the city's air quality to some of the worst on the globe and triggering a