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 northeastern United States, prompting health warnings and calls for residents to limit outdoor activities. Environment Canada reported an Air Quality Health Index (AQHI) reading of 10+, classified as “very high risk,” for Toronto, while forecasts suggested hazardous conditions could persist through Thursday night.

As of Tuesday night, just under 200 total active wildfires have been reported, according to the province.

A massive plume of smoke from wildfires burning across Canada has swept into the United States, degrading air quality across the Midwest, Northeast and Mid-Atlantic.

Environment Canada has issued health warnings after sky over city turns yellow

Toronto had the worst air quality of any major city in the world on Wednesday, the Swiss firm IQAir said, as Canadian authorities urged people to stay indoors.

Toronto had the worst air quality of any major city in the world on Wednesday, the Swiss firm IQAir said, as Canadian authorities urged people to stay indoors.

Over 100 wildfires are burning in Canada, with winds carrying the smoke southeast. Warnings about unhealthy air extend from Minnesota through Toronto and into New York.

Warnings about dangerous, unhealthy air extended Wednesday from Minnesota through Toronto and into New York.

Plusieurs feux de forêt ravagent le nord-ouest de l'Ontario. Selon la société IQAir, la capitale de la province, Toronto, était mercredi soir la deuxième métropole la plus polluée…

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

Residents have been warned to stay indoors to avoid both the smoke and the extreme heat

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…

La fumée émanant des incendies en cours dans le nord-ouest de l’Ontario a plongé la métropole dans un épais nuage de pollution, poussant les autorités à appeler les habitants à ne…

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

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.

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…

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Rauchschwaden, dunkler Himmel und schlechte Luftqualität: Nach Angaben der Regierung brannten am Mittwoch in Kanada rund 835 Feuer, von denen 112 als außer Kontrolle galten.

TORONTO: Toronto had the worst air quality of any major city in the world on Wednesday, the Swiss firm IQAir said, ...

Monitor ranks Toronto as having the worst air quality on earth, surpassing Kinshasa, DR Congo, and New Delhi, India.