Smoke from more than 100 active wildfires in northern Ontario have made Toronto\u2019s air quality the current worst in the world and caused yellow, smoky air in cities across the north-east US.<\/p>\n
Environment Canada issued health warnings on Wednesday after the sky over country\u2019s largest city turned a sickly yellow and was ranked the worst in the world according to IQAir<\/a>, the Swiss technology company that racks global air quality.<\/p>\n The city is also suffering a heatwave that shattered a three-decade record after reaching 37.3C in the downtown core, with runways at its main international airport hitting 55C.<\/p>\n The wildfires burning across northwestern Ontario have prompted mandatory evacuations from a number of First Nations communities.<\/p>\n Striking video footage of a train<\/a> near the community of Armstrong, Ontario, highlighted the speed and ferocity of the fires. \u201cThis could potentially overtake us here \u2026 This has gotten a little scary,\u201d says a crew member as a wall of flames whips across the windows.<\/p>\n The hazy Toronto skyline on Wednesday. Photograph: Anadolu\/Getty Images<\/p>\n \u201cWe\u2019re encased in flames now.\u201d<\/p>\n The railway company Canadian National confirmed the crew had been \u201csafely evacuated\u201d from the area.<\/p>\n Other images showed families fleeing their homes by boat<\/a> against the backdrop of massive plumes of smoke. \u201cMy family hometown, Collins Ontario, is GONE,\u201d Nadya Kwandibens, a photographer, posted on social media.<\/p>\n