Annualisation of Diffusion Tubes

The process of annualisation allows for annual mean pollutant concentrations to be estimated from extrapolation of short-term monitoring results.

This annualisation tool has been developed to assist local authorities to annualise NO2 diffusion tube monitoring data at sites with less than 9 months' usable data. The methodology consists of using NO2 concentration data from nearby continuous background monitoring sites to assist in estimating the annual mean NO2 concentrations from a diffusion tube site(s).

Download the Annualisation Tool Version 1 (XLSB, 1 MB)

See para 7.124 of Technical Guidance LAQM.TG(16) for more information.

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