Outdoor workers are donning masks, taking breaks or staying home altogether as wildfire smoke wafts across southern Ontario and health officials raise concerns.

The smoke from the wildfires in northern Ontario is expected to linger around until Friday. Check where and how it's moving here.

TORONTO/NEW YORK: Toronto’s air quality ranked the worst among major cities globally on Wednesday as wildfire smoke from northwestern Ontario blackened skies and spread into the…

Roughly 100 wildfires are raging out of control in Ontario, sending smoke streaming more than 1,000 miles from their origin.

A thick orange haze hung over Toronto on Wednesday 15 July as smoke from wildfires in northwestern Ontario engulfed Canada's largest city, giving it the worst air quality of any…

Wildfire smoke is dense enough in a handful of states that experts recommend masks for those who can’t stay indoors.

Fires in parts of Canada are blanketing several cities with smoke. Experts recommend limiting time outside, purifying indoor air and wearing a respirator if outside.

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Canadian wildfires in Ontario have triggered mass evacuations and sent hazardous smoke across parts of the US and Canada, causing unhealthy air quality, health warnings, and…

Outdoor workers are donning masks, taking breaks or staying home altogether as wildfire smoke wafts across southern Ontario and health officials raise concerns.

Toronto General Hospital and Toronto Western Hospital saw an 80 per cent spike in respiratory cases on Wednesday.

From mask effectiveness to long-term health risks, Star science reporter Kevin Jiang is taking your wildfire smoke questions live in the comments on Friday at 11 a.m.