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*Insufficient results due to freeze-ups in cold weather.
†Insufficient results due to presence of alkaline vapours from unknown
source.
As in 1962 it will be seen that during the winter months station
4 shows the highest smoke concentration with also an associated
high level of sulphur dioxide pollution, whilst throughout nearly the
whole year station 2 has the highest sulphur dioxide level with the
second highest level of smoke concentration.
The annual average for smoke (Table F) shows a marked
reduction over last year's figures, and a smaller reduction is seen
in the case of sulphur dioxide, except for station 2 where there was
a very slight increase.
But if one looks at the figures for the months of January and
February, 1963, it will be seen that the overall improvement is
not applicable.
There was no period of dense fog during 1963 but an extremely
cold spell, with heavy snowfalls and severe frost, was experienced
in January and February, resulting in increased fuel consumption
by industry, commerce and private householders.
Comparison with the corresponding months in 1962 and the
percentage increase in pollution levels are shown in Tables C and D.