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<p>The answer to Question 137401 referred to <em>total </em>particulate matter (TPM)
which is measured continuously at incinerators by their continuous emissions monitoring
systems (CEMS). TPM CEMS have to be calibrated by carrying out periodic sampling known
as a reference method (i.e. the most accurate method) side-by-side with the continuous
monitoring, and then adjusting the results obtained from the CEMS according to the
results obtained by periodic sampling. The reference method for dust (another term
for TPM) is set out in the British/European Standard BS EN 13284-1. It is therefore
appropriate to refer to the definition in BS EN 13284-1 for dust in order to define
TPM, which reads as follows:</p><p> </p><p><strong><em>“dust</em></strong></p><p><em>particles,
of any shape, structure or density, dispersed in the gas phase at the sampling point
conditions which may be collected by filtration under specified conditions after representative
sampling of the gas to be analysed, and which remain upstream of the filter and on
the filter after drying under specified conditions.”</em></p><p> </p>
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