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 1936
[Report of the Medical Officer of Health for Westminster, City of]
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To face page 106.
DEGREES OF POLLUTION.
CHART "A."
ATMOSPHERIC POLLUTION, AUTOMATIC AIR FILTER.
Readings taken at the City Hall.
Average degrees of suspended matters (mostly dirt) estimated for the years 1934, 1935 and 1936, 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.