London Borough of Hillingdon Monitoring Data

Heathrow Green Gates (T55)

Latitude: 51.481478
Longitude: -0.486675
Date Started: 04/05/2001
Altitude: 22 metres
Environment: Suburban Industrial

Latest Data

This monitoring site data was last updated: 01/03/2021 05:00

Parameter Pollution Band Concentration Period
PM10 particulate matter (Hourly measured) Low (Index 2) 18 µg/m3 (FIDAS) 24 Hour mean
PM2.5 particulate matter (Hourly measured) Low (Index 2) 15 µg/m3 (Ref.eq) 24 Hour mean
Nitrogen dioxide (NO2) Low (Index 1) 19 µg/m3 hourly mean
Nitric oxide (NO) not applicable 1 µg/m3 hourly mean
Nitrogen oxides as nitrogen dioxide (NOx as NO2) not applicable 19 µg/m3 hourly mean
PM1 Particulates (PM1) not applicable 14 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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Map showing the location of the Heathrow Green Gates monitoring site