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Diffusion Tube Sites - Frodsham and Helsby

The table below shows air quality monitoring data for diffusion tube sites in Frodsham and Helsby. Readings are in micrograms per cubic metre. The annual objective for nitrogen dioxide (NO2) is 40 micrograms per cubic metre. Results are as recorded at the monitoring site and do not necessarily represent pollution levels at nearby residences.


 Site  Type Pollutant 2016   2017 2018   2019
 (A56) High Street/Fluin FH  Roadside  NO2  44.2  39.4  38.5  36.9
 Church Street (a) CFL  Roadside  NO2  31.3  30.4  30.5  29.9
 Fluin Lane (a) FJ  Roadside  NO2  42.2  40.5  38.2  36.9
 Fluin Lane (b) FM  Roadside  NO2  36.5  33.2  35.0  29.4
 Fluin Lane (c) FT  Roadside  NO2  34.9  34.2  32.1  29.8
 High Street (Rock) FRC  Roadside  NO2  n/a  n/a  34.0  31.0
 High Street (Trinity) FTG  Roadside  NO2  n/a  n/a  33.2  30.6


 Site  Type  Pollutant  2016  2017  2018  2019
 Hillside School  Roadside  NO2  n/a  n/a  22.7  21.4

Diffusion tube sites can be viewed on the diffusion tube map below.

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