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 "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.
Weight of SO2
Visibility
Rainfall—Trace (Tr) = under 0.1 mm.
To face page 87.