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
Holborn 1961
[Report of the Medical Officer of Health for Holborn Borough]
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The solid matter expressed in tons falling over the area of Holborn month by month was as follows:—
| Month | Insoluble matter | Soluble matter | Total solids |
|---|---|---|---|
| January | 8.54 | 11.40 | 19.94 |
| February | 9.37 | 5.94 | 15.31 |
| March | 9.73 | .66 | 10.39 |
| April | 9.81 | 6.22 | 16.03 |
| May | 5.44 | 3.42 | 8.86 |
| June | 6.22 | 3.04 | 9.26 |
| July | 5.39 | 4.63 | 10.02 |
| August | 4.45 | 5.44 | 9.89 |
| September | 7.20 | 4.93 | 12.13 |
| October | 5.92 | 2.40 | 8.83 |
| November | 6.93 | 4.70 | 11.63 |
| December | 8.38 | 9.18 | 17.56 |
Daily Measurement of Suspended Matter
The Council has apparatus for making daily estimations of smoke installed at the
London School of Hygiene and Tropical Medicine, Keppel Street, and at the Royal
Institute of Public Health and Hygiene, Queen Square. The apparatus consists mainly
of an air pump which draws a known volume of air from outside and passes it through
a white filter paper. The amount of smoke collected is estimated by comparing the stain
on the paper with a calibrated scale of shades. The following recordings were obtained
during 1961:—
Concentration of smoke—microgrammes per cubic metre.
| Month | London School of Hygiene and Tropical Medicine | Royal Institute of Public Health and Hygiene | ||||
| Average Value | Highest Value | Lowest Value | Average Value | Highest Value | Lowest Value | |
| January | 27 | 66 | 16 | 30 | 58 | 15 |
| February | 30 | 59 | 16 | 25 | 49 | 8 |
| March | 40 | 81 | 17 | 30 | 82 | 11 |
| April | 114 | 180 | 70 | 148 | 230 | 100 |
| May | 6 | 12 | 1 | 8 | 16 | 4 |
| June | 7 | 10 | 4 | 9 | 13 | 4 |
| July | 6 | 12 | 4 | 6 | 13 | 4 |
| August | 6 | 10 | 3 | 8 | 16 | 4 |
| September | 8 | 14 | 5 | 11 | 17 | 6 |
| October | 12 | 27 | 5 | Recordings temporarily discontinued | ||
| November | 20 | 51 | 5 | |||
| December | 25 | 57 | 5 | |||