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Latest air quality summary

Number of monitoring sites in each pollution band

Heathrow Airwatch was last updated at 07:00 on Sunday 21st July 2019

  • Low25
  • Moderate0
  • High0
  • Very High0
  • No Data1
  • 26

    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 Green Gates LOW (Index 1) PM10  21/07/2019 06:00
PM2.5  21/07/2019 06:00
NO2  21/07/2019 05:00
Heathrow LHR2 LOW (Index 1) NO2  21/07/2019 06:00
PM10  21/07/2019 06:00
PM2.5  21/07/2019 06:00
BC  21/07/2019 06:00
Heathrow Oaks Road LOW (Index 1) NO2  21/07/2019 06:00
PM10  21/07/2019 06:00
PM2.5  21/07/2019 06:00
BC  21/07/2019 06:00
Hillingdon 1 - South Ruislip LOW (Index 1) 21/07/2019 06:00
Hillingdon Hayes LOW (Index 2) 21/07/2019 06:00
Hillingdon Sipson LOW (Index 1) 21/07/2019 06:00
Hounslow 2 - Cranford LOW (Index 1) 21/07/2019 06:00
Hounslow 4 - Chiswick High Road LOW (Index 1) 21/07/2019 04:00
Hounslow Boston Manor Park LOW (Index 1) 21/07/2019 06:00
Hounslow Brentford NO DATA 19/07/2019 10:00
Hounslow Feltham LOW (Index 1) 21/07/2019 06:00
Hounslow Gunnersbury LOW (Index 1) 21/07/2019 06:00
Hounslow Hatton Cross LOW (Index 1) 21/07/2019 06:00
Hounslow Heston Road LOW (Index 1) 21/07/2019 06:00
London Harlington LOW (Index 1) O3  21/07/2019 06:00
NO2  21/07/2019 06:00
PM10  21/07/2019 06:00
PM2.5  21/07/2019 06:00
London Hillingdon LOW (Index 1) 21/07/2019 06:00
London Hillingdon Harmondsworth LOW (Index 1) 21/07/2019 06:00
London Hillingdon Harmondsworth Os LOW (Index 2) 21/07/2019 05:00
London Hillingdon Oxford Avenue LOW (Index 1) 21/07/2019 03:00
Slough Brands Hill London Road LOW (Index 1) 21/07/2019 06:00
Slough Chalvey M4 LOW (Index 1) 21/07/2019 06:00
Slough Colnbrook LOW (Index 1) 21/07/2019 06:00
Slough Town Centre A4 LOW (Index 1) 21/07/2019 06:00
Slough Town Centre Wellington Street LOW (Index 1) 21/07/2019 06:00
Slough Windmill Bath Road NO DATA 16/07/2019 24:00
Spelthorne Sunbury Cross LOW (Index 1) 21/07/2019 06:00