Active Air Quality Alerts

Real-time air quality alerts for US cities. Monitor current health advisories, understand risks, and get safety recommendations for your area.

Last updated: Sep 16, 2026, 9:03 PM MDT
0
Total Active Alerts
Cities requiring caution
0
States Affected
Areas with advisories
0
Sensitive Group Alerts
AQI 101-150
0
General Public Alerts
AQI 151+
Good News! No Active Health Alerts
All monitored cities currently have air quality that is safe for outdoor activities. Continue to check regularly as conditions can change throughout the day.

Sensitive Groups

These groups are most at risk during poor air quality and should take precautions first:

  • Children and Teenagers
    Developing lungs are more vulnerable to pollution
  • Adults 65 and Older
    Age-related vulnerabilities increase risk
  • People with Asthma or COPD
    Pre-existing respiratory conditions worsen
  • People with Heart Disease
    Cardiovascular stress increases with pollution
  • Pregnant Women
    Protect both maternal and fetal health

Recommended Actions by Alert Level

AQI 101-150 (Orange)
  • • Sensitive groups limit prolonged outdoor activity
  • • Watch for symptoms like coughing or shortness of breath
AQI 151-200 (Red)
  • • Everyone should reduce prolonged outdoor exertion
  • • Sensitive groups should avoid outdoor activities
  • • Keep windows closed, use air conditioning
AQI 201-300 (Purple)
  • • Everyone should avoid outdoor activities
  • • Stay indoors with air filtration
  • • Wear N95 masks if you must go outside
AQI 301+ (Maroon)
  • • Everyone should remain indoors
  • • Run air purifiers continuously
  • • Evacuate if possible

Related Resources

Health Guide
For sensitive groups
Most Polluted Cities
Highest AQI rankings
Browse by State
All cities organized

About Air Quality Alerts

Air quality alerts are based on the latest AQI observations from EPA monitoring stations via the AirNow network. Alerts are categorized by EPA standards: Moderate (51-100), Unhealthy for Sensitive Groups (101-150), Unhealthy (151-200), Very Unhealthy (201-300), and Hazardous (301+). Alerts are recalculated from a fresh AirNow pull each time the site is published, so check AirNow.gov for minute-by-minute advisories during fast-moving events. When AQI exceeds 100, sensitive groups should take precautions. When AQI exceeds 150, everyone should limit outdoor exposure.