Key Facts
• Wildfires in the U.S. West and Canada worsen air pollution across the U.S.
• Air quality alerts issued on August 5 for 11 states in the Midwest and Northeast.
• Over 500 wildfires active in Canada, with 140 in Manitoba and 70+ in Saskatchewan.
• Detroit’s air quality ranked 3rd worst globally on August 4, reaching ‘unhealthy’ levels.
• PM2.5 particles in smoke pose severe health risks, including respiratory and cardiovascular issues.
• California’s Santa Barbara and San Luis Obispo counties issued evacuation orders on August 5.
• Ground-level smoke expected to clear by August 6, but upper atmospheric smoke may persist.
• Wildfires continue in 10 U.S. states, primarily affecting southern California.
Summary
Wildfires in the U.S. West and Canada have caused severe air pollution across the Midwest and Northeast, with air quality alerts issued for 11 states. Over 500 wildfires are active in Canada, significantly impacting air quality in cities like Detroit, which ranked among the world’s worst on August 4. Dangerous PM2.5 particles in the smoke pose health risks, particularly for vulnerable groups. While ground-level smoke is expected to clear by August 6, upper atmospheric smoke may linger. In California, evacuation orders remain in place as wildfires continue to spread.
