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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.

Further information

Information about diffusion tubes in Frodsham can be viewed in the document below.

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

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