Smoke from hundreds of Canadian wildfires blankets US Midwest and East Coast, triggering air quality alerts in over 20 states

Heavy smoke from hundreds of wildfires in Canada blanketed the U.S. Midwest and parts of the East Coast, triggering air quality alerts in more than 20 states. Officials reported 858 active fires across Canada, including 111 classified as out of control. Detroit registered the worst air quality of any city in the world on July 16, 2026, according to IQAir, with an index of 600, while cities including New York and Chicago experienced unhealthy to hazardous conditions. Officials cancelled outdoor events, distributed face masks and urged residents to limit their exposure to dangerous PM2.5 pollution.

Canadian wildfire smoke spread

• ▪Northwesterly winds were expected to keep smoke over parts of the Great Lakes and Northeast, with poor air quality potentially continuing into the weekend.
• ▪A lingering high pressure system has trapped the wildfire smoke close to the ground, reducing visibility to a half mile in some areas.
• ▪Smoke from hundreds of Canadian wildfires has spread across the United States, prompting air quality alerts in more than 20 states.

Air quality alerts issued

• ▪The U.S. Environmental Protection Agency's air quality map rated air quality as hazardous in parts of Pennsylvania, Michigan, Ohio, Illinois, Wisconsin, and Minnesota.
• ▪All of Michigan and much of Minnesota were placed under hazardous air quality alerts due to the wildfire smoke.
• ▪Air quality alerts spanned the Upper Midwest, the Great Lakes region, and the Northeast, stretching as far south as Maryland.

Health warnings for residents

• ▪Health officials advised residents in affected areas to limit strenuous outdoor activity, stay indoors, and wear N95 or KN95 masks if outdoors.
• ▪A study published in 2026 found that long-term exposure to tiny particles from wildfire smoke contributed to an average of 24,100 deaths a year in the lower 48 states.
• ▪Exposure to PM2.5 fine particle pollution from wildfire smoke can trigger breathing difficulties and aggravate asthma, heart conditions, and lung diseases.

City-specific smoke conditions

• ▪New York City opened cooling centres and moved public activities indoors, while New York state distributed tens of thousands of face masks.
• ▪Detroit registered the worst air quality of any city in the world on July 16, 2026, according to IQAir, with a pollutant index of 600.
• ▪Outdoor events in Minnesota, including a Creed concert at Mystic Lake Amphitheater and all scheduled Minneapolis outdoor programs, were canceled on July 16, 2026.

Ontario wildfire source

• ▪As of July 16, 2026, Canadian officials tallied 858 active wildfires burning across Canada, including 111 classified as out of control.
• ▪Roughly 5.9 million acres have burned during the 2026 wildfire season in Canada, driven by rising global temperatures and atmospheric drying.
• ▪Wildfires in northern Ontario forced evacuations of local First Nations communities, with Namaygoosisagagun First Nation Chief Helen Paavola stating her community was burnt to ashes.