Wildfire smoke from Canada is engulfing the US Midwest and Northeast, triggering widespread air quality alerts and health warnings. The haze is so severe that even healthy individuals are advised to take precautions.
Over 100 wildfires are currently raging out of control across Canada, with hundreds more being monitored. The smoke plume has traveled south and east, casting an orange glow over cities from Minnesota to New York, with Toronto commuters experiencing particularly dramatic scenes on Wednesday morning. Many areas are also grappling with a heatwave, pushing temperatures well above 90 degrees Fahrenheit with a higher heat index.
New York City's air quality index (AQI) reached 180 on Wednesday evening, classifying the air as "unhealthy" by the EPA. Some locations fared even worse, with Duluth, Minnesota, reporting an AQI exceeding 500, which is considered "hazardous." Forecasters expect these smoky conditions to intensify in parts of the Northeast on Thursday, including New York.
The smoke contains fine particulate matter known as PM2.5, particles about 30 times smaller than the width of a human hair. Exposure to PM2.5 can worsen existing respiratory conditions like asthma and lung diseases. Experts like Dr. Nicholas Nassikas from Harvard Medical School advise vulnerable populations, including children and the elderly, to limit outdoor activity. Even healthy adults might consider reducing time outdoors when the AQI surpasses 100, and wearing an N95 mask if extended outdoor exposure is unavoidable, suggests Jennifer Stowell, an assistant professor at the University of Maryland's School of Public Health.
Climate change is a significant factor, intensifying heat and creating drier conditions that fuel more explosive wildfires. This trend is projected to increase wildfire smoke-related deaths in the US significantly by 2050. While PM2.5 comes from various sources, wildfire smoke can contain a more toxic mix of pollutants, especially as fires burn through urban areas. Although N95 masks can filter some particles, they don't block all gaseous pollutants found in wildfire smoke.
While New York City has opened cooling centers to combat the heat and is distributing masks, these measures don't fully address the air quality issue. Experts emphasize that reducing emissions from sources like vehicles and power plants has improved air quality in the past, but wildfire smoke now presents the most significant and growing challenge to air quality nationwide.
