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

Environment Canada is warning of poor air quality and extreme heat in Toronto on Monday as southern Ontario braces for a week filled with hot and humid weather.

While some organizations have published clear air quality thresholds or contingency protocols for wildfire smoke, FIFA's plans remain unclear less than a year out from the 2026 World Cup.

There’s a layer of haze in the air, as smoke from burning wildfires has blown into southern Ontario. And according to the World Air Quality Index website, Toronto is one of the worst places in the world right now for air quality.

The city had among the worst air quality in the world for a time on Wednesday and officials warned that poor air quality in the area would likely last into Friday. By Dan Bilefsky Toronto has ...

The poor air quality that has blanketed swaths of central and Western Canada is not only infiltrating the lungs, but also distressing the mind.

Environment Canada is warning of poor air quality and extreme heat in Toronto on Monday as southern Ontario braces for a week filled with hot and humid weather.