Canadian Wildfire Smoke Causes Unhealthy Air Across US, Switzerland, Midwest, Northeast

Wildfire smoke from Canada is causing hazardous air quality across North America, including in Switzerland, the United States, and Canada itself. In Switzerland, particulate matter (PM2.5) levels reached more than ten times the World Health Organization's guideline values, leading to unhealthy air conditions especially for sensitive groups such as children and the elderly. Across the U.S., smoke from wildfires in British Columbia has resulted in unhealthy to very unhealthy air quality in several states, with smoky skies expected to persist due to stagnant high pressure near the East Coast. Pets, like humans, are also affected by wildfire smoke, experiencing respiratory distress and irritation, as reported in North Dakota. Health experts warn that wildfire smoke contains fine particles and pollutants that penetrate deep into the lungs, potentially causing respiratory and cardiovascular problems; long-term effects remain uncertain due to limited studies outside of firefighter populations. Authorities advise limiting outdoor activities, creating clean air spaces indoors, and taking precautions to protect both physical and mental health during these smoky conditions.