Hazardous air quality advisories have been issued across 16 U.S. states as smoke from uncontrolled wildfires in Canada blankets much of the country. Millions of Americans are being urged to stay indoors as the air quality in major metropolitan areas, including Chicago, Detroit, Washington, and New York, has reached levels comparable to or worse than smoking more than a dozen cigarettes daily.
The National Weather Service has alerted areas stretching from Minnesota and Illinois in the Midwest to New York, New Jersey, and Virginia on the East Coast. According to the Environmental Protection Agency (EPA), the air in regions from northern Minnesota to Columbus, Ohio, has been classified as 'hazardous,' the most severe rating.
The smoke originates from hundreds of forest fires burning in Canada, primarily in the province of Ontario. The polluted air contains fine particulate matter, or PM2.5, which are microscopic pollutants small enough to penetrate deep into human tissues. These toxins can cause severe respiratory problems and exacerbate existing heart and lung conditions.
In Detroit, Michigan, on Friday, the concentration of PM2.5 reached 267.8 micrograms per cubic meter (µg/m³). Health officials stated that inhaling this level of particulate matter in a single day is equivalent to smoking over 12 cigarettes.
Several major cities experienced significantly degraded air quality on Thursday and Friday. Chicago was obscured by smoke originating from Canada, and residents in New York reported difficulty breathing outdoors due to the intense pollution.
