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Latest air quality summary

Number of monitoring sites in each pollution band

Heathrow Airwatch was last updated at 22:00 on Tuesday 19th October 2021

  • Low23
  • Moderate0
  • High0
  • Very High0
  • No Data2
  • 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

Click on a monitoring site from the map above or the text summary below to view the latest data and graphs for the selected site.

Site Summary

Monitoring site Band/Index Last updated
Heathrow Bath Road LOW (Index 2) 19/10/2021 21:00
Heathrow Green Gates LOW (Index 2) NO2  19/10/2021 21:00
PM10  19/10/2021 21:00
PM2.5  19/10/2021 21:00
Heathrow LHR2 LOW (Index 1) NO2  19/10/2021 21:00
PM10  19/10/2021 21:00
PM2.5  19/10/2021 21:00
BC  19/10/2021 21:00
Heathrow Oaks Road LOW (Index 2) NO2  19/10/2021 21:00
PM10  19/10/2021 21:00
PM2.5  19/10/2021 21:00
BC  19/10/2021 21:00
Hillingdon 1 - South Ruislip LOW (Index 2) 19/10/2021 21:00
Hillingdon Hayes LOW (Index 1) 19/10/2021 06:00
Hillingdon Sipson LOW (Index 1) 19/10/2021 06:00
Hounslow 2 - Cranford NO DATA 08/04/2020 19:00
Hounslow 4 - Chiswick High Road LOW (Index 3) 19/10/2021 21:00
Hounslow Brentford NO DATA 19/10/2021 17:00
Hounslow Feltham LOW (Index 2) 19/10/2021 21:00
Hounslow Gunnersbury LOW (Index 2) 19/10/2021 21:00
Hounslow Hatton Cross LOW (Index 1) 19/10/2021 21:00
Hounslow Heston Road LOW (Index 2) 19/10/2021 21:00
London Harlington LOW (Index 2) O3  19/10/2021 21:00
NO2  19/10/2021 21:00
PM10  19/10/2021 21:00
PM2.5  19/10/2021 21:00
London Hillingdon LOW (Index 2) 19/10/2021 21:00
London Hillingdon Harmondsworth LOW (Index 2) 19/10/2021 21:00
London Hillingdon Harmondsworth Os LOW (Index 1) 19/10/2021 05:00
London Hillingdon Oxford Avenue NO DATA 19/10/2021 14:00
Slough Brands Hill London Road LOW (Index 2) 19/10/2021 21:00
Slough Chalvey M4 LOW (Index 1) 19/10/2021 18:00
Slough Colnbrook LOW (Index 2) 19/10/2021 18:00
Slough Town Centre Wellington Street LOW (Index 1) 19/10/2021 21:00
Slough Windmill Bath Road LOW (Index 1) 19/10/2021 21:00
Spelthorne Sunbury Cross LOW (Index 2) 19/10/2021 21:00