London Borough of Hounslow Monitoring Data

Hounslow Chiswick (HS4)

Latitude: 51.492507
Longitude: -0.257252
Date Started: 26/08/1999
Inlet Height: 4 metres
Environment: Urban Background

Latest Data

This monitoring site data was last updated: 07/12/2024 21:00

Parameter Pollution Band Concentration Period
Nitrogen dioxide (NO2) Low (Index 1) 10 µg/m3 hourly mean
PM10 particulate matter (Hourly measured) Low (Index 1) 8 µg/m3 (TEOM FDMS) 24 Hour mean
PM2.5 particulate matter (Hourly measured) Low (Index 1) 6 µg/m3 (TEOM FDMS) 24 Hour mean
Nitric oxide (NO) not applicable 3 µg/m3 hourly mean
Nitrogen oxides as nitrogen dioxide (NOx as NO2) not applicable 14 µg/m3 hourly mean
Non-volatile PM10 (Hourly measured) not applicable 4 µg/m3 (TEOM FDMS) 24 Hour mean
Volatile PM10 (Hourly measured) not applicable 3 µg/m3 (TEOM FDMS) 24 Hour mean
Non-volatile PM2.5 (Hourly measured) not applicable 3 µg/m3 (TEOM FDMS) 24 Hour mean
Volatile PM2.5 (Hourly measured) (Volatile PM2.5) not applicable 3 µg/m3 (TEOM FDMS) 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 Hounslow Chiswick monitoring site