Health risks as poor air quality hits the Midwest and northern states

Key Points:

• Over 800 wildfires in Canada are producing thick smoke that is drifting into the U.S., causing unhealthy air conditions from Milwaukee to Washington, D.C., affecting more than 100 million people.
• Several U.S. cities including Chicago, Detroit, Milwaukee, Pittsburgh, and Washington reported Air Quality Index (AQI) levels above 200, with some areas reaching the 300s, prompting health advisories and suspension of certain public services.
• Wildfire smoke contains harmful PM2.5 particles that can penetrate deep into the lungs and bloodstream, posing serious health risks especially for sensitive groups such as children, pregnant individuals, older adults, and those with respiratory or heart conditions.
• Health officials recommend staying indoors, limiting outdoor physical activity, using air purifiers or air conditioning on recirculate mode, and wearing N95 or KN95 masks when outside to reduce exposure to toxic smoke particles.
• Authorities have responded by issuing air quality alerts, providing free masks, opening shelters, and suspending services like trash pickup and public pool operations to protect public health during the smoke event.