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

  PM2.5 PM10 O3 AQI classification       
Current 13 18 14 18 Good Air Quality
     
Forecastmin avg maxmin avg maxmin avg max           
02-08-2026101825481125Good Air Quality
     
02-09-2026101721481021Good Air Quality
     
02-10-20261526338161833Good Air Quality
     
02-11-20261221376121737Good Air Quality
     
02-12-2026101420571020Good Air Quality
     
02-13-202671525481325Good Air Quality
     
02-14-20269132056920Good Air Quality
     
02-15-202610122355923Good 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: 02-10-2026 9:00 am