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Infringements of Smoke Control Orders
Warning Letters were sent in three cases where smoke was emitted in a Smoke Control
Area. The emissions were due in two cases to the burning of bituminous coal and in one
case the burning of cardboard cartons.
Acid Smuts from oil-burning chimneys
Towards the end of the year replacement of two metal stacks serving four large oilfired
central heating boilers was commenced. The new stacks are insulated to prevent the
formation of acid smuts, and are at the factory referred to in the last Annual Report.
This type of construction is now required for all new metal stacks serving oil fired
boilers.
Volumetric Method
The daily mean concentration of smoke and sulphur dioxide is measured by volumetric
apparatus in the Manor House.
The gauge faces west and a main road in a built up area of residential and commercial
premises.
The term "smoke" is used to denote all fine suspended impurity collected by the test
filter and expressed as milligrams per 100 cubic metres.

Note—Where blank spaces occur, readings were not available, i.e. in July, 1961,
because apparatus out of order and in December, 1962, because of heavy smoke stains
during the period of "smog." This occurred in the first week in December and, although
severe, was of shorter duration than in the great "smog" of 1952, which was fortunate, as
the amount of sulphur dioxide emitted and presumably held in the fog over a period of
days was, as can be seen, more than three times as high as on the worst day of the previous
year.
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