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Glossary

Click on a term from the list below to view a description and definition.



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  • Global Warming
  • Gravimetric Equivalent PM10 Data
    Monitoring of PM10 levels in the UK has, to date, been largely based upon the use of TEOM analysers. A principal concern with the TEOM instrument is that the filter is held at an elevated temperature (50°C) in order to minimise errors associated with the evaporation and condensation of water vapour. This can lead to the loss of the more volatile species (some hydrocarbons, nitrates etc.) and has led to the identification of differences between TEOM and gravimetric measurements at co-located sites. Currently a factor of 1.3 is applied to all TEOM measured concentrations to estimate the gravimetric equivalent. Further studies have been commissioned by Defra, the Scottish Executive, the Welsh Assembly Government and the Department for the Environment in Northern Ireland to investigate these effects, and to provide a more robust relationship between the TEOM and the European transfer gravimetric reference method.
  • Greenhouse Gases

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