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Latest air quality summary

Number of monitoring sites in each pollution band

Heathrow Airwatch was last updated at 19:00 on Monday 20th May 2024

  • Low21
  • Moderate0
  • High0
  • Very High0
  • No Data1
  • 22

    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) 20/05/2024 18:00
Heathrow Green Gates LOW (Index 2) PM10  20/05/2024 18:00
PM2.5  20/05/2024 18:00
NO2  20/05/2024 17:00
Heathrow LHR2 LOW (Index 2) NO2  20/05/2024 17:00
PM10  20/05/2024 17:00
PM2.5  20/05/2024 17:00
BC  20/05/2024 17:00
Heathrow Oaks Road LOW (Index 2) PM10  20/05/2024 18:00
PM2.5  20/05/2024 18:00
BC  20/05/2024 18:00
NO2  20/05/2024 17:00
Hillingdon 1 - South Ruislip LOW (Index 2) 20/05/2024 17:00
Hillingdon Hayes LOW (Index 3) 20/05/2024 17:00
Hillingdon Sipson LOW (Index 1) 20/05/2024 18:00
Hounslow 4 - Chiswick High Road LOW (Index 2) 20/05/2024 17:00
Hounslow Brentford LOW (Index 3) 20/05/2024 14:00
Hounslow Feltham NO DATA 16/05/2024 14:00
Hounslow Gunnersbury LOW (Index 2) 20/05/2024 17:00
Hounslow Hatton Cross LOW (Index 2) 20/05/2024 16:00
Hounslow Heston Road LOW (Index 2) 20/05/2024 18:00
London Harlington LOW (Index 2) NO2  20/05/2024 18:00
PM10  20/05/2024 18:00
PM2.5  20/05/2024 18:00
O3  19/05/2024 24:00
London Hillingdon LOW (Index 3) 20/05/2024 17:00
London Hillingdon Harmondsworth LOW (Index 2) 20/05/2024 13:00
London Hillingdon Harmondsworth Os LOW (Index 2) 20/05/2024 05:00
London Hillingdon Oxford Avenue LOW (Index 2) 20/05/2024 17:00
Slough Brands Hill London Road LOW (Index 2) 20/05/2024 17:00
Slough Town Centre Wellington Street LOW (Index 1) 20/05/2024 18:00
Slough Windmill Bath Road LOW (Index 2) 20/05/2024 17:00
Spelthorne Sunbury Cross LOW (Index 1) 20/05/2024 18:00