London Borough of Hillingdon Monitoring Data
London Harlington (HRL, an AURN site)
Date Started: 01/01/2004
This monitoring site data was last updated: 19/06/2021 03:00
|Ozone (O3)||No Data||8 Hour mean|
|Nitrogen dioxide (NO2)||Low (Index 1)||3 µg/m3||hourly mean|
|PM10 particulate matter (Hourly measured)||Low (Index 1)||4 µg/m3 (FIDAS)||24 Hour mean|
|PM2.5 particulate matter (Hourly measured)||Low (Index 1)||2 µg/m3 (Ref.eq)||24 Hour mean|
|Nitric oxide (NO)||not applicable||1 µg/m3||hourly mean|
|Nitrogen oxides as nitrogen dioxide (NOx as NO2)||not applicable||4 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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