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measure, to the coming into operation of Smoke Control Orders. The
peak concentration in December was lower than it has been for many
years.
It is known that there is an increased use of oil fuels, particularly
in industry. The graph indicating the monthly concentrations of
sulphur dioxide show some increase up to December, 1968, and a fall
in the early part of 1969. This high level in December is considerably
lower than in 1962/3 and 1964 but it is certainly higher than has been
recorded during the last three years. The use of higher chimneys,
more refined fuels and advanced boilerhouse equipment all have
an effect upon the average reduction of sulphur dioxide concentration.
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