Over 109 million people in the U.S. are experiencing poor air quality due to smoke from wildfires in Ontario. Major cities like Chicago and Detroit have reported hazardous air quality levels, prompting health warnings for residents to limit outdoor activities. Other areas, including Philadelphia and Cleveland, also recorded very unhealthy air quality indices.
The situation reflects a significant increase in wildfire activity in Canada, with smoke expected to continue spreading eastward. While some northeastern regions may see temporary relief, the ongoing fires pose a broader risk to air quality across North America and potentially Europe.