Canada is currently grappling with 146 active wildfires, with dozens raging in British Columbia and Alberta, labeled as "uncontrollable" by the Canadian Interagency Forest Fire Centre.
Across the border in the United States, alerts were declared in Montana, North Dakota, South Dakota, and Minnesota, propelled by smoke plumes carried by winds across the region.
The Minnesota Pollution Control Agency issued an air quality warning on Sunday in response to a "dense band of smoke from wildfires in northeastern British Columbia."
While the northern half of the state has cleared, southern Minnesota is expected to be shrouded in smoke on Monday as northerly winds weaken throughout the day.
The air quality index for Monday ranged from "moderate" to "unhealthy" across the four states, as per the U.S. Environmental Protection Agency's standards, which gauge daily air pollution levels and their associated risks.
Wildfire-induced air pollution is meticulously monitored due to the presence of fine particles in smoke, measuring less than 2.5 micrometers in diameter, capable of penetrating deep into the lungs.
Exposure to such particulate pollution can lead to inflammation, compromised immunity, and exacerbation of respiratory ailments like asthma, lung cancer, and chronic lung diseases, particularly affecting older adults, infants, children, and pregnant individuals.
In addition to measuring these fine particles (PM2.5), the air quality index tracks four other major pollutants: ground-level ozone, carbon monoxide, sulfur dioxide, and nitrogen dioxide.
Wildfires have consumed over 24,000 acres in western Canada, marking the onset of significant wildfires this season.
On Sunday, evacuation orders were issued for thousands of residents in Northern Rockies Regional Municipality and Fort Nelson First Nations in British Columbia due to rapidly advancing blazes.
Last summer, smoke from Quebec's wildfires blanketed vast swathes of the U.S., causing a sharp decline in air quality across cities from the Midwest to the Eastern Seaboard.
Canada endured its most devastating wildfire season on record last year, with over 45 million acres scorched, according to the Canadian Interagency Forest Fire Centre.
The nation is once again preparing for heightened fire risk this season.
The Canadian government stated on Friday that drought conditions "are expected to persist in high-risk regions in May," amplifying the "risk and severity of both natural and human-induced wildfires."
Research indicates that climate change is fostering warmer conditions conducive to vegetation drying, a critical factor in the ignition and spread of wildfires, making them more frequent and intense in a warming global climate.
