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 Brentford and Chiswick]
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GRAPH "F"
COMPARISON OF AVERAGE MONTHLY CONCENTRATIONS OF
SULPHUR DIOXIDE IN BRENTFORD AND CHISWICK DURING 1964
WITH THOSE OF 1954
CONCENTRATIONS EXPRESSED IN MICROGRAMMES PER CUBIC METRE
55