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Latest air quality summary

Number of monitoring sites in each pollution band

Heathrow Airwatch was last updated at 10:00 on Tuesday 28th September 2021

  • Low22
  • Moderate0
  • High0
  • Very High0
  • No Data3
  • 25

    Total monitoring sites

Green Low (1-3) Orange Moderate (4-6) Red High (7-9) Purple Very High (10)
Grey Offline | Find out more about the air pollution index and bandings

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Hillingdon Sipson

Parameter Pollution Band Concentration Period
Oxides of Nitrogen (NOXasNO2)
Updated: 27/09/2021 06:00		   No Data hourly mean
Nitrogen dioxide (NO2)
Updated: 27/09/2021 06:00		   No Data hourly mean
Nitric Oxide (NO)
Updated: 27/09/2021 06:00		   No Data hourly mean

Note: These results are based on provisional data. The data are presented in graphical form based on the highest pollutant measured at each site.