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 ''D"
COMPARISON OF CONCENTRATIONS OF SMOKE IN THE AIR AT BRENTFORD, CHISWICK
(2 STATIONS), CENTRAL LONDON, LEEDS AND LERWICK DURING 1961
CONCENTRATIONS EXPRESSED IN MICROGRAMMES PER CUBIC METRE
-47-