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Acid Smuts from Oil-burning chimneys
The new insulated metal stacks referred to in the last Annual Report to serve four large
oil-fired central heating boilers, were installed and in operation early in the year—and appear
to have remedied the nuisance from acid smuts in the surrounding area.
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 microgrammes per cubic metre.
The term "sulphur dioxide" includes all acid producing gases in the air with the
exception of carbon dioxide and is the net acidity of the air calculated as sulphur dioxide
and expressed as microgrammes per cubic metre of air.

†Figures not available.
Note—Where blank spaces occur, readings were not available, i.e. in December, 1962,
because of heavy smoke stains during the period of "smog".