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
London County Council 1933
[Report of the Medical Officer of Health for London County Council]
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68
Although these observations refer to horizontal directions they undoubtedly
indicate a real loss of light at 100 feet above ground level or thereabouts due to smoke
and fog in the colder and damper months of the year.