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Latest air quality summary
Number of monitoring sites in each pollution band
Heathrow Airwatch was last updated at 18:00 on Tuesday 20th April 2021
- Low22
- Moderate0
- High0
- Very High0
- No Data3
- 25
Total monitoring sites
Low (1-3)
Moderate (4-6)
High (7-9)
Very High (10)
Offline |
Find out more about the air pollution index and bandings
London Hillingdon Harmondsworth Os
| Parameter | Pollution Band | Concentration | Period |
|---|---|---|---|
| PM2.5 Particulate matter (PM2.5) Updated: 07/04/2021 24:00 |
No Data | 24 Hour mean | |
| PM10 Particulate matter (PM10) Updated: 07/04/2021 24:00 |
No Data | 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.
