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Latest air quality summary

Number of monitoring sites in each pollution band

Heathrow Airwatch was last updated at 05:00 on Thursday 23rd January 2020

  • Low22
  • Moderate1
  • High0
  • Very High0
  • No Data4
  • 27

    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) 23/01/2020 05:00
Heathrow Green Gates LOW (Index 2) PM10  23/01/2020 05:00
PM2.5  23/01/2020 05:00
NO2  23/01/2020 04:00
Heathrow LHR2 LOW (Index 2) NO2  23/01/2020 05:00
PM10  23/01/2020 05:00
PM2.5  23/01/2020 05:00
BC  23/01/2020 05:00
Heathrow Oaks Road LOW (Index 2) NO2  23/01/2020 05:00
PM10  23/01/2020 05:00
PM2.5  23/01/2020 05:00
BC  23/01/2020 05:00
Hillingdon 1 - South Ruislip LOW (Index 2) 23/01/2020 04:00
Hillingdon Hayes LOW (Index 2) 23/01/2020 04:00
Hillingdon Sipson LOW (Index 1) 23/01/2020 04:00
Hounslow 2 - Cranford NO DATA 21/01/2020 16:00
Hounslow 4 - Chiswick High Road LOW (Index 2) 23/01/2020 04:00
Hounslow Boston Manor Park LOW (Index 2) 23/01/2020 04:00
Hounslow Brentford LOW (Index 3) 23/01/2020 05:00
Hounslow Feltham LOW (Index 3) 23/01/2020 04:00
Hounslow Gunnersbury LOW (Index 2) 23/01/2020 05:00
Hounslow Hatton Cross NO DATA 22/01/2020 20:00
Hounslow Heston Road LOW (Index 2) 23/01/2020 04:00
London Harlington LOW (Index 2) O3  23/01/2020 05:00
NO2  23/01/2020 05:00
PM10  23/01/2020 05:00
PM2.5  23/01/2020 05:00
London Hillingdon LOW (Index 1) 23/01/2020 05:00
London Hillingdon Harmondsworth LOW (Index 2) 23/01/2020 04:00
London Hillingdon Harmondsworth Os LOW (Index 1) 23/01/2020 01:00
London Hillingdon Oxford Avenue LOW (Index 2) 23/01/2020 05:00
Slough Brands Hill London Road LOW (Index 2) 23/01/2020 05:00
Slough Chalvey M4 NO DATA 22/01/2020 19:00
Slough Colnbrook LOW (Index 2) 22/01/2020 23:00
Slough Town Centre A4 NO DATA 18/11/2019 11:00
Slough Town Centre Wellington Street LOW (Index 1) 23/01/2020 05:00
Slough Windmill Bath Road LOW (Index 1) 23/01/2020 05:00
Spelthorne Sunbury Cross LOW (Index 3) 23/01/2020 05:00