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Latest air quality summary
Number of monitoring sites in each pollution band
Heathrow Airwatch was last updated at 20:00 on Tuesday 26th January 2021
- Low22
- Moderate0
- High0
- Very High0
- No Data3
- 25
Total monitoring sites





Hillingdon Sipson

Parameter | Pollution Band | Concentration | Period |
---|---|---|---|
Oxides of Nitrogen (NOXasNO2) Updated: 26/01/2021 07:00 |
not applicable | 112 µg/m3 | hourly mean |
Nitrogen dioxide (NO2) Updated: 26/01/2021 07:00 |
Low (Index 1) | 49 µg/m3 | hourly mean |
Nitric Oxide (NO) Updated: 26/01/2021 07:00 |
not applicable | 41 µg/m3 | hourly 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.