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
Chislehurst 1961
[Report of the Medical Officer of Health for Chislehurst]
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Footscray County Primary School, Footscray.
Monthly deposit in tons per square mile during 1961.
| Jan. | Feb. | Mar. | Apr. | May | June | July | Aug. | Sept. | Oct. | Nov. | Dec. | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Water (in rain in inches) | 2.49 | 1.9 | 0.49 | 1.44 | 1.31 | 1.45 | 1.06 | 1.8 | 2.05 | 3.18 | 2.64 | 2.92 |
| pH Value | 5.31 | 6.23 | 5.54 | 7.35 | 7.38 | 7.4 | 7.32 | 7.06 | 6.74 | 6.72 | 6.65 | 7.37 |
| Total undissolved matter | 5.15 | 4.23 | 4.32 | 4.41 | 5.44 | 5.05 | 4.76 | 4.05 | 4.31 | 3.24 | 5.57 | 6.69 |
| Soluble in CS2 | 0.07 | 0.05 | 0.08 | 0.04 | 0.07 | 0.09 | 0.1 | 0.09 | 0.11 | 0.05 | 0.06 | 0.07 |
| Ash | 3.70 | 2.93 | 3.13 | 3.25 | 3.72 | 3.44 | 3.3 | 2.53 | 2.96 | 2.2 | 3.95 | 5.16 |
| Other combustible matter | 1.37 | 1.25 | 1.11 | 1.12 | 1.65 | 1.52 | 1.36 | 1.43 | 1.24 | 0.99 | 1.56 | 1.46 |
| Total dissolved matter | 8.59 | 8.32 | 3.41 | 9.59 | 5.57 | 6.21 | 3.42 | 3.29 | 10.91 | 7.45 | 14.03 | 16.58 |
| Ca++ | 1.13 | 1.42 | 0.72 | 1.87 | 0.85 | 0.99 | 0.6 | 0.49 | 1.87 | 0.87 | 2.4 | 3.3 |
| Cl' | 1.21 | 0.77 | 0.44 | 0.67 | 0.47 | 0.57 | 0.5 | 0.54 | 0.77 | 1.48 | 1.81 | 2.15 |
| So4" | 3.04 | 3.57 | 1.71 | 3.24 | 1.85 | 2.30 | 2.11 | 1.53 | 4.66 | 3.59 | 6.03 | 6.52 |
| Total solids | 13.74 | 12.55 | 7.73 | 14.0 | 11.01 | 11.26 | 8.18 | 7.34 | 15.22 | 10.69 | 19.6 | 23.27 |
| Sulphur dioxide (milligrams of So4 per day collected by 100 sq. cms. Pbo2) | 1.76 | 1.46 | 1.71 | 1.03 | 1.19 | 0.9 | 0.73 | 0.65 | 0.78 | 0.98 | 1.48 | 1.76 |