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DAILY MEAN CONCENTRATION OF SMOKE AND SULPHUR DIOXIDE
A smoke filter and volumetric sulphur dioxide apparatus was
installed in Manor Park House after consulting the Department of
Scientific and Industrial Research as to the suitability of the
site.
A dally record has been kept, since the 1st November, 1958,
of the amount of smoke or suspended matter and sulphur dioxide in
the air.
It has long been recognised that a distinction must be drawn
between relatively coarse particles of solid matter which are
quickly deposited by their own weight,, and which comprise most
of the particulate matter collected in the deposit gauge, and
the very fine particles which settle slowly. If at all. These
fine particles, commonly referred to as "smoke", are less than
about 20 microns (0.002 cm) in size and consist largely of
carbonaceous matter, including tar, produced by the incomplete
combustion of coal; some fine ash is also included. It is
important to realise that little of this fine material is collected
in the deposit gauge which in consequence gives no Information
about pollution by smoke. To obtain such Information a smoke
filter is necessary.