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 1935
[Report of the Medical Officer of Health for Westminster, City of]
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To face page 108.
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
1935 shown thus
Average degrees of suspended matters (mostly dirt) estimated for the years 1933, 1934 and 1935, 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.