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 1938
[Report of the Medical Officer of Health for Westminster, City of]
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CHART “A."
ATMOSPHERIC POLLUTION, AUTOMATIC AIR FILTER.
Readings taken at City Hall, Charing Cross Road.
1938 shown thus
Average for the 6 years 1932-37
Average degrees of suspended impurities estimated for the year 1938, compared with the average for the years
1932-1937, 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.
To face page 87,
DEGREES OF POLLUTION.
(1 degree = 0.54 lb. of dirt per million cubic yards of air.)