A massive plume of smoke from wildfires burning across northwestern Ontario spread across Canada and the northeastern United States this week, prompting air quality warnings and reducing visibility across much of southern Ontario. The plume was visible from satellite imagery and aircraft thousands of feet above the ground as smoke drifted eastwards.
NASA Earth Observatory said smoke from the fires streamed over Ontario, Quebec and parts of the US Midwest and Northeast. Citing figures from the Canadian Interagency Forest Fire Centre, NASA said almost 850 fires were burning across Canada by mid-July, including more than 180 in Ontario.
