A significant air quality crisis has gripped the United States, with toxic smoke from Canadian wildfires blanketing vast areas and causing three major U.S. cities to register among the world's most polluted.
Residents in the Northeast and Upper Midwest were advised to remain indoors and wear masks as hazardous air quality persisted. New York's skyline turned orange, and Chicago officials closed beaches and outdoor pools to protect the public from smog. At least 14 states, including Indiana, Pennsylvania, New Hampshire, and West Virginia, have been affected by the wildfire smoke.
On Thursday, Detroit topped IQAir's global air quality rankings with an Air Quality Index (AQI) of 566, followed by Minneapolis at 289 and Chicago at 259. These readings surpass those typically seen in South Asia, regions often known for poor air quality. An AQI between 201 and 300 is classified as 'very unhealthy,' with officials warning of adverse effects from prolonged exposure.
The smoke contains fine particulate matter, or PM2.5, which is small enough to penetrate deep into the lungs and enter the bloodstream. State and local health departments across the affected cities issued air quality alerts, urging residents to limit outdoor activities.
Reports from affected areas described symptoms such as headaches, burning eyes, and irritated throats. Residents in Chicago noted that the smoke was significantly worse than in previous years and made breathing difficult. "This is far worse than the summer two and three years ago," one resident commented on Facebook. "It hurts to breathe, and I don't have health issues!"
Hundreds of wildfires continue to burn across Canada, contributing to the smoke affecting densely populated U.S. areas. States reporting smoke impact include Illinois, Vermont, New Jersey, Massachusetts, Connecticut, Minnesota, Michigan, and Rhode Island.
Michigan issued a statewide air quality alert as smoke plumes spread south. Officials urged residents to avoid strenuous outdoor activities and monitor for symptoms like wheezing, coughing, or dizziness. Recommendations included closing windows and running air conditioning systems with high-efficiency filters.
In Minnesota, parts of the state reached the 'hazardous' category for air quality, with record hourly readings in the Twin Cities. Officials advised the general public to avoid all outdoor physical activity.
Northern Illinois declared red air pollution action days for Rockford and Chicago-area zones. Similar advisories were issued for parts of Indiana, with PM2.5 levels expected to reach unhealthy ranges. Ohio issued a statewide advisory, with northeastern counties facing particularly dangerous conditions. Pennsylvania was under a statewide Code Red alert, signifying unhealthy air for everyone.
New York issued fine-particle advisories across much of the state, with AQI readings exceeding 200 in western parts of the state. Alerts also extended across New England and into northern New Jersey, with West Virginia's northern counties also under an air quality alert. The smoke was expected to linger into Friday, with some areas forecast to see a decrease in pollution levels to 'unhealthy for sensitive groups.'