X  Close Official AQ sensor station - Athens, Boulder-CU, Colorado, USA

  PM2.5 PM10 O3 AQI classification       
Current 17 15 14 17 Good Air Quality
     
Forecastmin avg maxmin avg maxmin avg max           
08-15-20267141935619Good Air Quality
     
08-16-2026132235571135Good Air Quality
     
08-17-2026202835791235Good Air Quality
     
08-18-2026182235891435Good Air Quality
     
08-19-20262126338111333Good Air Quality
     
08-20-20261924339111533Good Air Quality
     
08-21-20262024418111541Good Air Quality
     
08-22-202627283711121437Good Air Quality
     
            

classification AQI The health effects should be based on 24 hours average values only.
Good Air Quality 0-50 Air quality is considered satisfactory, and air pollution poses little or no risk
Moderate Air Quality 50-100 Air quality is acceptable; however, for some pollutants there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.
Unhealthy for some 100-150 Members of sensitive groups may experience health effects. The general public is not likely to be affected.
Unhealthy Air Quality 150-200 Everyone may begin to experience health effects; members of sensitive groups may experience more serious health effects.
Very Unhealthy 200-300 Health alert: everyone may experience more serious health effects
Hazardous Air Quality > 300 Health warnings of emergency conditions. The entire population is more likely to be affected
 More information:  EPA Air Quality Index      Sensor data captured at: 08-17-2026 8:00 am