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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 month of December included a period of fog which
developed during the evening of Monday, 3rd December and became
denser on Tuesday, 4th December. Conditions improved slightly
on Wednesday, 5th December, but fog persisted quite densely until
mid-day on Friday, 7th December. It will be remembered that
ten years previously, from 4th - 9th December, 1952, a similar
dense foggy period was experienced.
For comparison with the average daily amounts of smoke and
sulphur dioxide recorded in tables A and B, the daily figures for
this foggy period, December 3rd - 7th, 1962, are given in tables
C and D :
C. Smoke (microgrammes per cubic metre) 24 hours period ending
9 a.m.