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52
in the monthly average figures. This variation was found to have
a close connection with the outdoor temperature. The minimum
pollution occurred during the summer months when little or no
coal is used for artificial heating. During the winter, the smoke
pollution reached almost ten times the summer average; the
colder the weather, the more fuel is burned. The annual variations
are clearly shown on the attached graphs and curves for Central
London are also shown for comparison. The graphs were prepared
by the Superintendent of Observations, Department of Scientific
and Industrial Research, who comments that "there is more
smoke in Leyton during the winter owing to the larger number of
coal-burning open domestic fires, whereas the sulphur dioxide is
lower throughout the whole year, since there is a smaller total
consumption of fuel in Leyton".