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

  PM2.5 PM10 O3 AQI classification       
Current 13 9 14 14 Good Air Quality
     
Forecastmin avg maxmin avg maxmin avg max           
10-15-20266111835818Good Air Quality
     
10-16-20261229587122058Moderate Air Quality 
    
10-17-202691740461440Good Air Quality
     
10-18-20268111335813Good Air Quality
     
10-19-20261222377121837Good Air Quality
     
10-20-202692241391541Good Air Quality
     
10-21-20261836588152358Moderate Air Quality 
    
10-22-2026152459692259Moderate 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: 10-17-2026 11:00 am