Heathrow Airwatch uses cookies to make the site simpler. Find out more about this

Latest air quality summary

Number of monitoring sites in each pollution band

Heathrow Airwatch was last updated at 16:00 on Tuesday 20th April 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

« Return to site summary list

Hillingdon Sipson

Maximum pollution level at this monitoring site is Index 1
Parameter Pollution Band Concentration Period
Oxides of Nitrogen (NOXasNO2)
Updated: 20/04/2021 06:00 		not applicable 101 µg/m3 hourly mean
Nitrogen dioxide (NO2)
Updated: 20/04/2021 06:00 		Low (Index 1) 37 µg/m3 hourly mean
Nitric Oxide (NO)
Updated: 20/04/2021 06:00 		not applicable 42 µg/m3 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.