A groundbreaking study has revealed the devastating impact of Canadian wildfire smoke, linking it to approximately 70,000 premature deaths. The research highlights that a staggering 385 million individuals were exposed to hazardous levels of PM2.5—fine particulate matter known to cause severe respiratory and cardiovascular issues—for extended periods. This alarming finding underscores the urgent need to address the growing threat of extreme wildfires as a global public health crisis.