London Borough of Hillingdon Monitoring Data
Heathrow Green Gates (T55)
Latitude: 51.481478
Longitude: -0.486675
Date Started: 04/05/2001
Longitude: -0.486675
Date Started: 04/05/2001
Altitude: 22 metres
Environment: Suburban Industrial
Environment: Suburban Industrial
Latest Data
This monitoring site data was last updated: 22/06/2025 10:00
| Parameter | Pollution Band | Concentration | Period |
|---|---|---|---|
| Nitrogen dioxide (NO2) | Low (Index 1) | -2 µg/m3 | hourly mean |
| PM10 particulate matter (Hourly measured) | Low (Index 1) | 15 µg/m3 (FIDAS) | 24 Hour mean |
| PM2.5 particulate matter (Hourly measured) | Low (Index 1) | 8 µg/m3 (Ref.eq) | 24 Hour mean |
| Nitric oxide (NO) | not applicable | 2 µg/m3 | hourly mean |
| Nitrogen oxides as nitrogen dioxide (NOx as NO2) | not applicable | 0 µg/m3 | hourly mean |
| PM1 Particulates (PM1) | not applicable | 7 µg/m3 (FIDAS) | 24 Hour 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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