Wildfire smoke is proving to be a serious health hazard, extending far beyond the immediate vicinity of fires. Recent events in Ontario, Canada, saw smoke travel 1,000 kilometers to Toronto, creating hazardous air quality and an "almost post-apocalyptic" orange sky. Emergency department physician Erin O’Connor reported a noticeable increase in patients experiencing respiratory problems and allergies. The smell of burning was pervasive, even inside buildings with air filtration systems. Scientists are now working to understand the specific links between wildfire smoke exposure and health impacts, as more frequent and intense “fire weather” events occur. The situation highlights the widespread and growing threat posed by wildfire smoke to public health.