Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London
[Report of the Medical Officer of Health for Hendon]
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The rate of improvement in the cleanliness of the air cannot be constant as it
must always be related to several variable factors - more fuel will be used in very
cold weather, the air will be dirtier in periods of calm - however when looked at
over a period of several years the pattern of improvement is encouraging.
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