London Borough of Hounslow Monitoring Data
Hounslow Chiswick (HS4)
Date Started: 26/08/1999
Environment: Urban Background
This monitoring site data was last updated: 03/12/2021 19:00
|Nitrogen dioxide (NO2)||Low (Index 2)||72 µg/m3||hourly mean|
|PM10 particulate matter (Hourly measured)||Low (Index 2)||17 µg/m3 (VCM)||24 Hour mean|
|PM2.5 particulate matter (Hourly measured)||Low (Index 1)||10 µg/m3 (BAM)||24 Hour mean|
|Nitric oxide (NO)||not applicable||98 µg/m3||hourly mean|
|Nitrogen oxides as nitrogen dioxide (NOx as NO2)||not applicable||221 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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