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Volatile Correction Model (VCM) Web Portal News from the LAQN

King’s have opened a new web portal that allows local authorities and other users of TEOM measurements to correct their data using the Volatile Correction Model (VCM).

The VCM uses FDMS purge measurements to correct TEOM measurements for their loss of volatile material. This facility has been funded by Defra and will form part of their Local Air Quality Management Tools.

This method is recommended in Defra’s draft technical guidance as the preferred method for correcting TEOM measurements for Local Air Quality Management purposes.

The web portal requires users to input the location of their TEOM and the dates and time resolution of the measurements that they wish to correct.

The web portal then identifies the closest FDMS instruments, which will provide the input into the calculation, and inserts the relevant measurements into a spreadsheet that can be downloaded or emailed. The user then pastes their TEOM measurements into the spreadsheet; corrected concentrations are calculated automatically.

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Item date 16/07/2008

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