Latest air quality summary
Number of monitoring sites in each pollution band
Heathrow Airwatch was last updated at 01:00 on Monday 20th May 2024
- Low20
- Moderate1
- High0
- Very High0
- No Data1
- 22
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
Offline | Find out more about the air pollution index and bandings
Hounslow Gunnersbury
Parameter | Pollution Band | Concentration | Period |
---|---|---|---|
PM10 Particulate matter (PM10) Updated: 19/05/2024 23:00 |
Low (Index 3) | 34 µg/m3 (Ref.eq) | 24 Hour mean |
Oxides of Nitrogen (NOXasNO2) Updated: 19/05/2024 24:00 |
not applicable | 18 µg/m3 | hourly mean |
Nitrogen dioxide (NO2) Updated: 19/05/2024 24:00 |
Low (Index 1) | 16 µg/m3 | hourly mean |
Nitric Oxide (NO) Updated: 19/05/2024 24:00 |
not applicable | 1 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.