X  Close Official AQ sensor station - St Helens

  PM2.5 PM10 O3 AQI classification       
Current 17 5 17 Good Air Quality
     
Forecastmin avg maxmin avg maxmin avg max           
14-07-20255662336Good Air Quality
     
15-07-20253552235Good Air Quality
     
16-07-20255782358Good Air Quality
     
17-07-2025591424614Good Air Quality
     
18-07-2025881045510Good Air Quality
     
19-07-20258142147921Good Air Quality
     
20-07-20255793359Good Air Quality
     
21-07-20256773557Good 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: 16-07-2025 20:00