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Minnesota wildfires prompt burning restrictions as air quality improves
Hundreds of firefighters are battling the blazes as a campfire ban takes effect and air quality is expected to improve by Wednesday, officials said.
On Wednesday, Minnesota set new air pollution records as the MPCA's West Duluth monitor recorded 617.8 micrograms per cubic meter, the highest reading since monitoring began in 2014.
Wildfires across the Superior National Forest have fueled the crisis, with Natural Resources Canada reporting more than 830 active wildfires burning across the country, concentrated around the Boundary Waters Canoe Area Wilderness.
The U.S. Forest Service closed the entire Boundary Waters Canoe Area Wilderness on July 14, marking only the third full closure in 50 years, while the Minnesota Department of Natural Resources activated burning restrictions on Monday.
IQAir ranked Duluth the most polluted city in the country Wednesday with a local reading of 802 on the AQI scale, prompting officials to urge residents to stay indoors to avoid health risks.
State officials warn the Minnesota fires could burn for months as Canada's fire season builds through August, though forecasters expect a cold front to clear the air by Friday morning.