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We use diffusion tubes to monitor air quality at over 80 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 full years. Readings are in micrograms per cubic metre. The annual objective for nitrogen dioxide (NO2) is 40 micrograms per cubic metre. During years when no monitoring took place, results are shown as n/a. The monitoring sites are reviewed and updated each year and new sites will not be shown until a full year of monitoring has been completed and ratified.
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.
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