London's Pulse: Medical Officer of Health reports 1848-1972
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Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London
Barking 1955
[Report of the Medical Officer of Health for Barking]
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SOLID DEPOSIT 1955
In this pictorial representation of pollution density the middle of
each circle is on the site of a deposit gauge. Starting at the middle,
one tenth of an inch represents one month's reading and the weight
of pollution is indicated by the shades shown below.
Under 20 tons per square
mile per month.
20-25 tons per square
mile per month.
25-30 tons per square
mile per month.
Over 30 tons per square
mile per month.
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