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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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) | 2.13 | 1.85 | 0.57 | 1.47 | 1.55 | 1.38 | 0.99 | 2.25 | 2.01 | 2.95 | 2.43 | 2.62 |
| pH Value | 4.86 | 5.6 | 6.15 | 7.24 | 7.38 | 7.5 | 7.42 | 6.96 | 6.75 | 6.75 | 6.21 | 7.01 |
| Total undissolved matter | 3.92 | 4.63 | 7.09 | 5.19 | 7.22 | 6.0 | 5.21 | 3.71 | 4.14 | 3.02 | 6.78 | 5.88 |
| Soluble in CS2 | 0.1 | 0.05 | 0.13 | 0.06 | 0.07 | 0.15 | 0.12 | 0.13 | 0.08 | 0.06 | 0.13 | 0.09 |
| Ash | 2.54 | 3.23 | 5.48 | 3.79 | 4.66 | 4.29 | 3.54 | 2.65 | 3.01 | 2.08 | 4.49 | 4.53 |
| Other combustible matter | 1.29 | 1.35 | 1.48 | 1.34 | 2.39 | 1.56 | 1.55 | 0.93 | 1.06 | 0.88 | 2.16 | 1.25 |
| Total dissolved matter | 4.97 | 7.05 | 5.03 | 8.15 | 4.97 | 4.60 | 3.89 | 4.9 | 14.3 | 6.85 | 10.07 | 10.94 |
| Ca + + | 0.48 | 1.2 | 1.07 | 1.66 | 0.8 | 0.72 | 0.61 | 0.73 | 1.49 | 0.8 | 1.52 | 2.21 |
| Cl' | 0.94 | 0.77 | 0.47 | 0.74 | 0.54 | 0.47 | 0.47 | 0.47 | 0.71 | 1.28 | 1.48 | 1.81 |
| So4" | 1.33 | 3.12 | 2.01 | 3.28 | 1.55 | 1.6 | 1.29 | 1.83 | 3.69 | 3.48 | 3.9 | 4.68 |
| Total solids | 8.89 | 11.68 | 12.12 | 13.34 | 12.09 | 10.6 | 9.1 | 8.61 | 18.44 | 9.87 | 16.85 | 16.82 |
| Sulphur dioxide (milligrams of SO3 per day collected by 100 sq. cms. PbO2) | 2.09 | 2.17 | 1.94 | 1.67 | 1.45 | 1.03 | 0.89 | 0.89 | 1.09 | 1.22 | 2.76 | 2.38 |