Canadian Wildfires Blanket US Midwest and Northeast with Hazardous Smoke

More than 850 active wildfires across Canada have generated a massive plume of smoke that has drifted south into the United States, driving air‑quality indexes into the hazardous range for millions of people. Cities such as Detroit, Chicago, Minneapolis, and New York have recorded some of the worst AQI values on the planet, with Detroit briefly ranking as the most polluted major city worldwide. State and provincial health agencies in Michigan, Ohio, Indiana, Illinois, New York and other states issued emergency air‑quality alerts, urging residents to stay indoors, close windows, use high‑efficiency filtration and wear N95 masks when outdoors.

The smoke has disrupted daily life and major events. Cedar Point amusement park in Ohio closed early, the Chicago Fire‑Vancouver MLS match was postponed, and officials warned that the World Cup final in New York‑New Jersey could be affected if conditions do not improve. U.S. lawmakers from Michigan have written to Canadian Prime Minister Justin Trudeau demanding better forest‑management practices, while the American Conservation Coalition criticized Canada’s “failure to manage its forests.”

Health officials stress that fine particulate matter (PM2.5) can aggravate asthma, heart disease and other chronic conditions, and that vulnerable groups—including children, seniors and people with respiratory illnesses—should limit outdoor activity. The smoke is expected to linger through the weekend as additional plumes arrive from the north.