Canadian Wildfire Smoke Engulfs Northeast US, Prompting Health Warnings
Thick smoke from Canadian wildfires is blanketing large parts of the US Midwest and Northeast, causing hazardous air quality and raising concerns about health impacts as climate change worsens fire seasons.
Smoke from devastating wildfires in Canada is covering a wide area of the US Midwest and Northeast this week, triggering air quality warnings in many cities. In Toronto, morning commuters faced orange skies on Wednesday, while New York City’s air quality index (AQI) reached 180, classified as "unhealthy" by the US Environmental Protection Agency. Duluth, Minnesota, saw AQI levels above 500, a level considered "hazardous" and unsafe for everyone. Smoky conditions are expected to worsen in parts of the Northeast, including New York, on Thursday.
The smoke contains PM2.5 particles, which are smaller than 2.5 micrometers and can cause or worsen health conditions, especially in vulnerable groups. Dr. Nicholas Nassikas, a pulmonologist at Harvard Medical School, advises patients with asthma or lung diseases to limit time outdoors. Children and the elderly are particularly at risk. Jennifer Stowell, an assistant professor at the University of Maryland's School of Public Health, says even healthy adults should reduce outdoor activity when AQI exceeds 100 and recommends wearing N95 masks for prolonged exposure.
Climate change is driving longer and more intense wildfire seasons by creating hotter and drier conditions. A study published last year estimated that wildfire smoke already causes 40,000 deaths annually in the US, and that number could more than double to 70,000 by 2050 if warming continues. A similar smoke event from Canadian wildfires occurred in the Northeast in 2023.
PM2.5 comes from various sources like traffic and power plants, but wildfire smoke is particularly toxic because it includes burned homes, vehicles, and other structures. New York City has opened cooling centers where masks are distributed, but they cannot filter gaseous pollutants. According to Dan Westervelt, an associate professor of climate physics at Columbia University, the challenge of wildfire smoke now overshadows other pollution sources after decades of progress in cleaning up air from vehicles and power plants.
