London Borough of Hillingdon Monitoring Data
Heathrow Green Gates (T55)
Date Started: 04/05/2001
Environment: Suburban Industrial
This monitoring site data was last updated: 21/09/2021 09:00
|Nitrogen dioxide (NO2)||Low (Index 1)||24 µg/m3||hourly mean|
|PM10 particulate matter (Hourly measured)||Low (Index 1)||14 µg/m3 (FIDAS)||24 Hour mean|
|PM2.5 particulate matter (Hourly measured)||Low (Index 1)||8 µg/m3 (Ref.eq)||24 Hour mean|
|Nitric oxide (NO)||not applicable||20 µg/m3||hourly mean|
|Nitrogen oxides as nitrogen dioxide (NOx as NO2)||not applicable||54 µg/m3||hourly mean|
|PM1 Particulates (PM1)||not applicable||6 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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