Practical Guidance on using NO2 Diffusion Tubes for LAQM

Defra and the Devolved Administrations commissioned a Working Group, comprising representation from Defra and the Devolved Administrations, laboratories, the Health and Safety Laboratory, the Environment Agency, the Scottish Environment Protection Agency (SEPA) and other stakeholders, aimed at harmonising the methodology used in preparing, utilising and analysing diffusion tubes.

The Working Group's report (PDF 1.34 MB) was published in February 2008. This includes guidance on all aspects of diffusion tube use in the context of LAQM: tube preparation, handling, use, analysis and calculation of results. It is recommended that Local Authorities refer to this more detailed guidance, some of which is summarised in the Technical Guidance LAQM.TG(16).

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