Key Facts

• More than 150,000 people in Iowa and Illinois were advised to stay indoors.
• Air quality monitoring showed an Air Quality Index (AQI) of 281 in Davenport, Iowa.
• "Very unhealthy" air quality levels mean increased health risks for everyone.
• The EPA advised those with heart or lung conditions, older adults, and children to avoid outdoor activities.
• The exact cause of the poor air quality was not immediately known.
• Poor air quality can cause respiratory issues, such as coughing or difficulty breathing.
• Davenport, Iowa, recorded the worst air quality in the U.S. at the time.