London Borough of Hillingdon Monitoring Data
London Hillingdon (HIL, an AURN site)
Latitude: 51.496330
Longitude: -0.460861
Date Started: 02/08/1996
Longitude: -0.460861
Date Started: 02/08/1996
Altitude: 34 metres
Environment: Urban Background
Environment: Urban Background
Latest Data
This monitoring site data was last updated: 04/11/2025 08:00
| Parameter | Pollution Band | Concentration | Period |
|---|---|---|---|
| Ozone (O3) | Low (Index 2) | 51 µg/m3 | 8 Hour mean |
| Nitrogen dioxide (NO2) | Low (Index 1) | 39 µg/m3 | hourly mean |
| PM10 particulate matter (Hourly measured) | Low (Index 1) | 11 µg/m3 (FIDAS) | 24 Hour mean |
| PM2.5 particulate matter (Hourly measured) | Low (Index 1) | 5 µg/m3 (Ref.eq) | 24 Hour mean |
| Nitric oxide (NO) | not applicable | 13 µg/m3 | hourly mean |
| Nitrogen oxides as nitrogen dioxide (NOx as NO2) | not applicable | 59 µg/m3 | hourly mean |
Note: Values are based on provisional data. Data are GMT hour ending.
PM10 is measured as a running 24 hour mean, up to the current hour, and the band/index is calculated accordingly.
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