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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Smoke - milligrammes per 100 Cubic Metres
GRAPH "D"
COMPARISON OF CONCENTRATIONS OF SMOKE IN THE AIR
AT BRENTFORD, CHISWICK, CENTRAL LONDON, LEEDS AND LERWICK
DURING 1960
-44-
Brentford ———— Chiswick
London Leeds _ Lerwick