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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 Friday 10th 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 4 - Chiswick High Road
Parameter | Pollution Band | Concentration | Period |
---|---|---|---|
PM2.5 Particulate matter (PM2.5) Updated: 10/05/2024 18:00 |
Low (Index 2) | 15 µg/m3 (BAM) | 24 Hour mean |
PM10 Particulate matter (PM10) Updated: 10/05/2024 18:00 |
Low (Index 2) | 25 µg/m3 (INDIC GRAV) | 24 Hour mean |
Oxides of Nitrogen (NOXasNO2) Updated: 10/05/2024 14:00 |
not applicable | 111 µg/m3 | hourly mean |
Nitrogen dioxide (NO2) Updated: 10/05/2024 14:00 |
Low (Index 1) | 55 µg/m3 | hourly mean |
Nitric Oxide (NO) Updated: 10/05/2024 14:00 |
not applicable | 37 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.