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Latest air quality summary
Number of monitoring sites in each pollution band
Heathrow Airwatch was last updated at 16:00 on Wednesday 6th July 2022
- Low22
- Moderate0
- High0
- Very High0
- No Data0
- 22
Total monitoring sites





Hounslow 4 - Chiswick High Road

Parameter | Pollution Band | Concentration | Period |
---|---|---|---|
PM2.5 Particulate matter (PM2.5) Updated: 06/07/2022 14:00 |
Low (Index 1) | 7 µg/m3 (BAM) | 24 Hour mean |
PM10 Particulate matter (PM10) Updated: 06/07/2022 14:00 |
Low (Index 2) | 18 µg/m3 (VCM) | 24 Hour mean |
Oxides of Nitrogen (NOXasNO2) Updated: 06/07/2022 14:00 |
not applicable | 12 µg/m3 | hourly mean |
Nitrogen dioxide (NO2) Updated: 06/07/2022 14:00 |
Low (Index 1) | 6 µg/m3 | hourly mean |
Nitric Oxide (NO) Updated: 06/07/2022 14:00 |
not applicable | 4 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.