London Borough of Hounslow Monitoring Data

« Return to local authority summary

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: 02/11/2025 06:00

Parameter Pollution Band Concentration Period
Nitrogen dioxide (NO2) Low (Index 1) 9 µg/m3 hourly mean
PM10 particulate matter (Hourly measured) Low (Index 1) 10 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 1 µg/m3 hourly mean
Nitrogen oxides as nitrogen dioxide (NOx as NO2) not applicable 10 µg/m3 hourly mean
Non-volatile PM10 (Hourly measured) not applicable 9 µg/m3 (TEOM FDMS) 24 Hour mean
Volatile PM10 (Hourly measured) not applicable 1 µg/m3 (TEOM FDMS) 24 Hour mean
Non-volatile PM2.5 (Hourly measured) not applicable 5 µg/m3 (TEOM FDMS) 24 Hour mean
Volatile PM2.5 (Hourly measured) (Volatile PM2.5) not applicable 0 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.

Other monitoring sites

Use the dropdown below to switch to another monitoring site within this local authority.

Map showing the location of the Hounslow Chiswick monitoring site