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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 26th January 2021
- Low22
- Moderate0
- High0
- Very High0
- No Data3
- 25
Total monitoring sites





London Hillingdon Harmondsworth Os

Parameter | Pollution Band | Concentration | Period |
---|---|---|---|
PM2.5 Particulate matter (PM2.5) Updated: 26/01/2021 09:00 |
Low (Index 1) | 4 µg/m3 (Osiris) | 24 Hour mean |
PM10 Particulate matter (PM10) Updated: 26/01/2021 09:00 |
Low (Index 1) | 8 µg/m3 (INDIC GRAV) | 24 Hour 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.