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Latest air quality summary
Number of monitoring sites in each pollution band
Heathrow Airwatch was last updated at 09:00 on Saturday 27th July 2024
- Low20
- Moderate0
- High0
- Very High0
- No Data2
- 22
Total monitoring sites
![Green](http://www.heathrowairwatch.org.uk/images/map_legend_1-3.jpg)
![Orange](http://www.heathrowairwatch.org.uk/images/map_legend_4-6.jpg)
![Red](http://www.heathrowairwatch.org.uk/images/map_legend_7-9.jpg)
![Purple](http://www.heathrowairwatch.org.uk/images/map_legend_10.jpg)
![Grey](http://www.heathrowairwatch.org.uk/images/map_legend_0.jpg)
Slough Brands Hill London Road
![Maximum pollution level at this monitoring site is Index 2](images/dials/ap_2.gif)
Parameter | Pollution Band | Concentration | Period |
---|---|---|---|
PM10 Particulate matter (PM10) Updated: 27/07/2024 06:00 |
Low (Index 2) | 17 µg/m3 (Ref.eq) | 24 Hour mean |
Oxides of Nitrogen (NOXasNO2) Updated: 27/07/2024 07:00 |
not applicable | 44 µg/m3 | hourly mean |
Nitrogen dioxide (NO2) Updated: 27/07/2024 07:00 |
Low (Index 1) | 28 µg/m3 | hourly mean |
Nitric Oxide (NO) Updated: 27/07/2024 07:00 |
not applicable | 11 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.