Climate extremes fuel explosive wildfires in Canada and western U.S.

ONP Summary

Hundreds of wildfires burning across Canada, with approximately 100 active fires in Ontario, have caused smoke to spread over 1,000 miles into the US Northeast and Midwest, prompting air quality alerts across at least 16 states. Toronto air reached critical pollution levels on Wednesday, ranking worst among global major cities, while evacuations occurred in remote US wilderness areas.