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Air quality monitoring

We monitor local air quality around the clock using a range of sophisticated 'real-time' analysers as well as a network of simpler diffusion tubes.

Real-time monitoring

Opsis equipment

We currently operate six real time stations which monitor pollutants such as nitrogen dioxide, sulphur dioxide and particulates as well as weather data.              
An interactive map shows all the realtime monitoring stations within Cheshire West and Chester and by selecting an icon it allows access to the data gathered at each station. Our  Realtime Monitoring Graph page provides access to graphs of the most recent monitoring data.

Diffusion tubes

Two diffusion tubesWe have been using diffusion tubes since 1986 to monitor air pollution. We currently use over 80 tubes, at a range of locations across the borough. They are very useful and play a major role in our monitoring regime as they can be fixed to lamp-posts and building facades close to the source of pollution. The interactive map shows all the diffusion tube sites in Cheshire West and Chester. You can access the data at each site and search by postcode.

Data management

An independent data management specialist collects readings automatically from the analysers several times a day. Provisional data on this website is then updated daily. Thorough quality control checks are applied to the data each year to ensure its accuracy.

The results from the air quality monitoring campaign have proved very useful for local air quality management and form a key part of the consultation process for the future development of housing, industry, roads and commerce within the area.

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