Smoke from over 200 wildfires burning across Canada is drifting into the United States, triggering air quality alerts and raising health concerns.
As of Wednesday, 203 fires were active, according to the Canadian Interagency Forest Fire Centre. Hazy skies and alerts have been reported from the Upper Midwest to New York. AirNow data shows air quality in affected areas ranges from “moderate” to “unhealthy.”
Experts say even small amounts of wildfire smoke can be harmful. “There’s no such thing as safe wildfire smoke,” said Helen Christoni, air quality expert at AirDoctor. “Any of it is too much for us.”
Wildfire smoke contains gases and fine particulate matter called PM2.5—tiny particles that can enter the lungs and even the bloodstream. These can cause eye and throat irritation, breathing problems, and worsen conditions like asthma and heart disease. Vulnerable groups include children, the elderly, pregnant women, and those with existing health conditions.
A 2021 study found PM2.5 from wildfires can be up to 10 times more harmful than other pollution. Smoke can travel hundreds of miles, affecting people far from the fires themselves.
Health effects can include coughing, wheezing, chest pain, and increased risk of heart attacks, strokes, and even premature death. Some studies also link wildfire smoke to neurological and mental health issues.
To stay safe, experts recommend using HEPA-filter air purifiers indoors, sealing windows and doors, and wearing a high-quality mask outdoors when air quality is poor.
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