Climate-fueled wildfires are turning North American skies orange

A US-focused analysis shows wildfire activity is rising across North America, with smoke from hundreds of Canadian fires drifting far south and turning skies orange in cities from Toronto to New York and Chicago. Climate change is driving hotter, drier conditions that fuel larger, more persistent fires, sending smoke hundreds to thousands of miles and triggering hazardous air quality. Health risks rise with prolonged exposure, prompting guidance to limit outdoor activity, wear masks, and seal buildings when air quality is poor.