X  Close Official AQ sensor station - St Helens

  PM2.5 PM10 O3 AQI classification       
Current 5 5 5 Good Air Quality
     
Forecastmin avg maxmin avg maxmin avg max           
17-07-2026591334513Good Air Quality
     
18-07-20261837446141944Good Air Quality
     
19-07-202629333711121337Good Air Quality
     
20-07-20262030427111542Good Air Quality
     
21-07-202633404615192246Good Air Quality
     
22-07-202671841361941Good Air Quality
     
23-07-20263582338Good Air Quality
     
24-07-20265893559Good 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: 19-07-2026 02:00