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Map of diffusion tube sites

We use diffusion tubes to monitor air quality at over 70 locations in the borough. You can use the interactive map below to find out more about where the diffusion tubes are located, reasons for monitoring and the levels of air pollution over the last four years. Readings are in micrograms per cubic metre. The annual objective for nitrogen dioxide (NO2) is 40 micrograms per cubic metre.

Please note that kerbside and roadside sites generally represent worst-case situations. Because levels of nitrogen dioxide tend to decline rapidly away from the carriageway, the data is not necessarily representative of air pollution at nearby properties.

Please also note that the map also shows historic tubes at locations where monitoring was discontinued prior to 2013. These tubes will either display ‘N/A’ for all four years to 2016, or will display values for the period 2010-2013 only.

Key to map symbols

SymbolSite typeDescription
Urban background Urban residential areas away from sources of pollution
Kerbside Within one metre of the kerb
Roadside Typically one to five metres from the kerb
Suburban Residential areas on the outskirts of towns
Industrial Used to monitor industrial emissions
Rural Open countryside away from roads, industry and populated areas
Other Specific emission sources such as car parks


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