Canadian Wildfires in 2023 Led to Increased Respiratory Hospitalizations in U.S. Cities
In 2023, Canada experienced an unprecedented wildfire season, with over 18 million hectares burned. The smoke from these massive wildfires spread across a wide area, causing substantial air pollution in numerous U.S. cities. This deterioration in air quality led to a significant increase in hospital admissions and emergency department visits, particularly among patients with respiratory diseases like asthma. For instance, in June 2023, New York City was ranked as having the worst air pollution worldwide due to smoke from Quebec wildfires, temporarily surpassing traditionally polluted metropolitan areas. The particulate matter, specifically PM2.5, from wildfire smoke is identified as particularly dangerous, capable of penetrating the lungs and entering the bloodstream, exacerbating existing respiratory, cardiovascular, and metabolic conditions.