[Report of the Medical Officer of Health for London, City of ] page 25

City of London 1964

[Report of the Medical Officer of Health for London, City of ]

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There are two deposit gauges in the City one on the roof of the Guildhall Office Block and
one at the City Mortuary. The rainwater and deposited matter are collected during the month
by means of a bowl which has been scientifically measured. On the 1st of the month it is taken
to the Public Analyst for general analysis and the results are forwarded to the Department of
Scientific and Industrial Research. A similar procedure is carried out in connection with lead
peroxide method. The lead peroxide candles are exposed to the atmosphere for 1 month and then
analysed by the Public Analyst
The operators of the volumetric apparatus on the four City sites have again carried out observations
and recordings in a most efficient manner.
Changes in the siting of the instruments at Cloak Lane and the City Mortuary will have
to be considered during 1965 when both these stations will be closed down due to redevelopment.
The results of the atmospheric pollution investigations in the City are set out in the following
tables.
TABLE I — Deposit Gauge
The rainwater collected was slightly less than the average for the past five years but there
was an increase in the amount of soluble and insoluble deposits at both stations.
TABLE II — Smoke concentrations by the volumetric method
The concentration of smoke recorded during 1964 was below the average for the past five
years.
T ABLE III — Sulphur measurement by the volumetric and lead peroxide methods
The concentration of sulphur recorded in 1964 was slightly higher than the average for the
past five years.

Table: TABLE I — Results obtained in 1964 of the monthly observations of rainfall and deposited matter by means of the deposit gauges.

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TABLE I — Results obtained in 1964 of the monthly observations of rainfall and deposited matter by means of the deposit gauges.

MONTH	Rainfall collected in deposit gauge				DEPOSITS
	Equivalent to				Insoluble		Soluble Total
	Millimetres	inches of rain	Millimetres	inches of rain	Tons per square mile
	STATIONS (see note below)
	A		B		A	B	A	B	A	B
January	13	0.51	12	0.48	17.36	15.84	7,25	9.16	24.61	25.00
February	30	1.20	18	0.72	15.37	9.65	38.29	6.63	53.66	16.28
March	57	2.24	73	2.86	83.42	21.14	16.66	11.01	100.09	32.15
April	75	2.96	75	2.94	17.75	19.03	31.36	29.44	49.12	48.47
May	48	1.90	50	1.98	37.89	22.87	9.70	28.18	47.59	51.05
June	—	—	105	4.13	—	10.74	—	12.58	—	23.32
July	45	1.79	42	1.67	30.54	14.82	13.12	8.33	43.65	23.15
August	32	1.27	35	1.36	13.94	10.10	7.05	5.06	21.00	15.16
September	10	0.39	11	0.45	20.90	8.70	9.04	5.57	29.94	14.28
October	29	1.15	33	1.29	21.00	17.57	12.49	11.39	33.48	28.96
November	34	1.32	35	1.39	14.57	14.89	10.13	10.91	24.71	25.80
December	28	1.11	33	1.29	12.25	16.25	9.01	11.66	21.26	27.91
Averages:
1964	36	1.44	44	1.71	25.91	15.13	14.92	12.49	40.83	27.63
1963	37	1.45	41	1.63	16.30	12.48	16.93	10.07	33.23	22.55
1962	43	1.69	40	1.58	14.80	14.21	9.51	8.49	24.31	22.69
1961	42(a)	1.66(a)	44	1.71	14.02(a)	15.08	9.05(a)	1 7.80	23.05(a)	22.88
1960	62	2.46	63	2.49	14.58	12.39	7.55	8.15	22.13	20.55
1959	41	1.60	44(a)	1.72(a)	19.81	14.81(a)	8.16	19.00(a)	29.64	23.80(a)
1959-1963	45	1.77	46	1.83	15.90	13.79	10.24	10.70	26.47	22.49

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NOTE: A — Golden Lane
(a) average for 10 months
B — Guildhall from 1st June, 1958
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City of London 1964

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Table: TABLE I — Results obtained in 1964 of the monthly observations of rainfall and deposited matter by means of the deposit gauges.

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