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 1956
[Report of the Medical Officer of Health for Barking]
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SOLID DEPOSIT 1956
In this pictorial representation of pollution density the base of
each flag mast is on the site of a deposit gauge. 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 squ
mile per month.
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