DULUTH – Canadian wildfires filling Minnesota skies with smoke show no sign of easing, and Minnesota health officials are warning that hazardous air will continue blanketing the entire state into next week.
The Minnesota Pollution Control Agency is extending an air quality alert that was to end Friday afternoon until 3 p.m. Tuesday for the entire state. The worst of it will arrive on Saturday morning, with a "very unhealthy" air forecast for the Twin Cities metro area stretching in a broad area north to the Canadian border. The rest of the state is also under alerts of "unhealthy" or "unhealthy for sensitive groups."
Health officials said those with heart and lung conditions should limit their exposure outdoors, and everyone who can avoid exertion — indoors or outdoors — should do so. Heavy smoke that carries fine particulate matter can increase the chances of heart attack.
"It inevitably means there's going to be more heart attacks — usually emergency heart attacks," said Dr. Rory Farnan, an interventional cardiologist at Essentia Health in Fargo. "We tend to see it on bad air days in cities all over the world."
The smoke is streaming into Minnesota from uncontrolled fires on more than half a million acres in Ontario, and some of the largest are in remote areas about 150 miles north of Lake of the Woods.
"If you're experiencing smoke, you're probably getting it from the large fires on the Ontario/Manitoba border," said Chris Marchand, fire information officer for the Ontario natural resources ministry.
A cluster of smaller fires are burning on thousands of acres in Quetico Provincial Park, some just a mile from the Minnesota border. "In the larger scheme of things, we have larger fish to fry in terms of our larger regional situation," Marchand said. The Quetico fires are being observed but not actively battled, he said.
Already Ontario has had nearly twice as many fires this year — 976 — compared with its 10-year average. The same drought conditions that are plaguing Minnesota and the American West set the stage for an intense fire season in Canada this summer.