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 1934
[Report of the Medical Officer of Health for Westminster, City of]
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To face page 84
DEGREES OF POLLUTION.
(1 degree = 0.54 lbs of dirt per million cubic yards of air.)
CHART "A."
ATMOSPHERIC POLLUTION, AUTOMATIC AIR FILTER
Readings taken at the City Hall.
1933 shown thus - - - - - - - -
1934 shown thus
Average degrees of suspended matters (mostly dirt) estimated for the years 1933 and 1934, 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.