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
City of Westminster 1937
[Report of the Medical Officer of Health for Westminster, City of]
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To face page 96.
DEGREES OF POLLUTION.
(1 degree = 0.54 lb. of dirt per million cubic yards of air.)
CHART "A."
ATMOSPHERIC POLLUTION, AUTOMATIC AIR FILTER.
Readings taken at the City Hall.
1937 shown thus—
Average for 5 years 1931-36—
Average degrees of suspended matters (mostly dirt) estimated for the year 1937, compared with the average for the five
years 1931-36, showing the variations at each hour in the 24 hours. The means are calculated on this graph to show in
convenient form the sum of pollution throughout the whole year interpreted in terms of a single period of 24 hours.