Dangerous wildfire smoke continues to blanket parts of the U.S.

Key Points:

• Heavy smoke from over 800 active wildfires in Canada, fueled by extreme heat and dry conditions, is spreading across the Great Lakes region into New England and as far south as Maryland, causing unhealthy to hazardous air quality in multiple states.
• Record-breaking heat in Ontario and northern Minnesota, with temperatures exceeding 100 degrees, has created a heat dome that intensified wildfire activity and smoke spread, forcing thousands to evacuate and severely impacting air quality in areas including Minnesota, Wisconsin, Michigan, Philadelphia, New York City, and Baltimore.
• Experts attribute the increasing frequency and intensity of wildfire smoke events to human-driven climate change, which leads to longer droughts and heat waves, resulting in drier vegetation that fuels wildfires.
• Wildfire smoke contains tiny particles harmful to human health, linked to increased risks of heart attacks, strokes, respiratory illnesses, pregnancy complications, and developmental disorders in children; prolonged exposure significantly raises premature death rates.
• Health officials advise monitoring air quality reports, reducing outdoor activities, using air purifiers and N95 masks, and creating cleaner air spaces at home to mitigate risks, especially as extreme heat and smoke combine to elevate public health dangers.