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Latest air quality summary
Number of monitoring sites in each pollution band
Heathrow Airwatch was last updated at 08:00 on Friday 29th March 2024
- Low21
- Moderate0
- 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
Slough Chalvey M4
Sorry, no data are available for this monitoring site on the date selected
This monitoring site closed on 27/10/2021
Note: These results are based on provisional data. The data are presented in graphical form based on the highest pollutant measured at each site.