A study of TEOM measurements made at Marylebone Road has revealed that the software configuration of your TEOM can have a substantial effect on the measurements of PM10 and PM2.5.

Two aspects of the TEOM set-up were found differ between the US and Europe conventions. As well as the US EPA inbuilt volatility correction factor, which elevates daily mean measurements by as much as 4 µg m-3, the US temperature and pressure reporting conditions can lead to an increase the daily mean by as much as 7 µg m-3. This temperature and pressure setting was found to have the greatest impact in cold conditions.

This research has been published in Atmospheric Environment (Green and Fuller 2006, Issue 40, pg 5608 5616) or for more information contact David Green at david.green@erg.kcl.ac.uk.

Item date 10/09/2006