By Erica Dischino, Patrick Wingrove and Amanda Stephenson
DULUTH, Minnesota (Reuters) -Smoke from wildfires burning in three Canadian provinces is spreading into the U.S. Upper Midwest, stirring memories of the severe pollution that drifted south from Canada two years ago during that country’s worst fire season on record.
The particulate matter pollution caused by the smoke is already drifting into Minnesota and neighboring states. It is expected to make its way to New York and other East Coast cities in coming days, posing a health risk to the tens of millions who live in those regions.
“Airborne particulate matter is the most serious environmental health risk we know of,” said Doug Brugge, a public health researcher at the University of Connecticut School of Medicine. “It causes cardiovascular, respiratory and neurological harm, and these plumes of smoke are at very high levels compared to what we’re usually exposed to in the U.S.”
Scores of wildfires have swept across Canada since the start of May, forcing thousands of evacuations and disrupting crude oil production in the country. There were more than 200 active fires as of Monday, 106 of which were out of control, according to the Canadian Interagency Forest Fire Centre.
So far, 1.9 million hectares (4.7 million acres) have burned, mostly in the provinces of Alberta, Saskatchewan and Manitoba. Still, the current crisis does not yet come close to rivaling 2023, when 17 million hectares burned.
One of the worst spots in the U.S. for air quality on Tuesday morning as a result of the fires was Ely, Minnesota, near the Manitoba border. It registered a “hazardous” air quality index reading of 336, according to IQAir, a website that monitors air quality around the world.
An air quality rating of below 50 is considered to be “good,” and readings between 100 and 300 are deemed “unhealthy” to “very unhealthy,” while higher than that is considered “hazardous,” according to the website.
In Duluth, Minnesota, the rating stood at 309 at midmorning Tuesday, while in Flin Flon, Manitoba, about 800 miles (1,300 km) to the north and in one of the areas where the Canadian wildfires are concentrated, the AQI was at 359.
In IQAir’s list of the world’s major cities, Minneapolis ranked as second worst air quality, with a 210 reading, trailing only Kuwait City, which led the list with a 318 reading.
VULNERABLE PEOPLE
Children, the elderly and people with chronic cardiac, respiratory and other illnesses are most vulnerable to the effects of the smoke, especially those with cardiovascular problems, according to Brugge.
“The risk of hospitalization and death is low in people who are healthy and at a young age,” he said, adding that there is still evidence that air pollution exposure increases blood pressure and inflammation for those people.
Experts have said that particulates from wildfire smoke enter most buildings in high concentrations, although the problem is greater in older structures.
The concentration of wildfire pollutants indoors is on average about half of what it is outdoors, but if a building is not well sealed, the concentration may be up to 70% of what it is outside, experts have said.
The U.S. Environmental Protection Agency advises that during wildfire smoke events, people avoid indoor activities that put more fine particles into the air, such as smoking cigarettes, frying or broiling food, burning candles or incense, and vacuuming without a HEPA filter.
Exposure to wildfire smoke may also increase lung cancer patients’ risk of dying from their disease, particularly among non-smokers, although the effect may be mitigated by certain cancer treatments, according to a large California study presented last month.
Nonetheless, some farmers believe the effects of the fires are not all negative. In online forums like Facebook, some farmers have said some of their best yields ever came from years with a heavy pall of wildfire smoke from Canada. The smoke can protect vulnerable crops from scorching sunlight, they think.
(Reporting by Patrick Wingrove in New York, Rich McKay in Atlanta, Amanda Stephenson in TorontoAdditional reporting by Ed White in WinnipegWriting by Patrick WingroveEditing by Frank McGurty and Frances Kerry)
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