Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London
[Report of the Medical Officer of Health for Westminster, City of]
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To face page 96.
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CHART "B."
ATMOSPHERIC POLLUTION.
SULPHUR GAS IN THE ATMOSPHERE.
Variations throughout the year of S02 measured by weight, with corresponding readings of rainfall, wind and visibility.