Diffusion Tube Monitoring
The map below shows all the diffusion tube monitoring sites
within the Borough. You can search the map by postcode, town,
or just zoom in to your local area, however please bear in mind
that unless you live very close to a diffusion
tube site, the levels at your house may vary
significantly from those shown.
The Air Quality Objective for Nitrogen Dioxide
is 40 µg/m3 (Annual Mean)
Key to map symbols:
||Urban residential areas away from
sources of pollution
||Within 5 metres of the kerb
||Typically 5 to 15 metres from
||Residential areas on the outskirts of
towns (>15m from major roads)
||Used to monitor industrial
||Open countryside away from roads,
industry or populated areas
||Specific emission sources such as car
parks, motorways or other monitoring categories.
All levels are shown as Bias Adjusted Annual Means.