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It can be seen that a much higher percentage increase in smoke
concentration was recorded at Stations 3 and 4 (low and high
residential density areas not, at present, in smoke control areas)
than at Station 1 (medium residential density smoke controlled
area).
It is significant to note that the percentage increase in sulphur
dioxide recordings is similar at all four stations. Many criticisms
of the use of solid smokeless fuels are received by the Health Department,
during the period preceding the introduction of a new smoke
control area, on the grounds that excessive sulphur fumes are
emitted by the manufactured fuels. The figures shown in Table
D indicate strongly that this is not so.
The information gleaned from these figures is encouraging,
and, in the years to come will give valuable information in relation
to the progress made in smoke control areas.
The tables E and F show the ratio of smoke to sulphur dioxide
and the annual averages.