[Report of the Medical Officer of Health for London, City of ] page 19

City of London 1971

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

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Table: TABLE 1 Results obtained in 1971 of the monthly observations of rainfall and deposited matter by means of the deposit gauge at Guildhall.

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TABLE 1 Results obtained in 1971 of the monthly observations of rainfall and deposited matter by means of the deposit gauge at Guildhall.

Month	Rainfall collected in the deposit gauge		Deposited Matter (Tons per square mile)
Month	Millimetres	Inches	Insoluble	Soluble	Total
January	64	2.52	74.55	33.01	107.56
February	11	0.42	27.99	13.23	41.22
March	39	1.53	31.56	30.03	61.59
April	36	1.44	19.12	38.59	57.71
May	72	2.70	39.76	29.01	68.77
June	128	5.08	12.85	24.63	37.48
July	24	0.93	14.01	10.94	24.95
August	88	3.66	12.21	14.43	26.64
September	16	0.59	10.49	10.86	21.35
October	64	2.43	10.66	—	—
November	—	—	—	—	—
December	23	0.83	6.90	14.42	21.10
Averages
1971	51	2.01	23.64	21.99	46.83
1970	41	1.61	18.92	6.98	25.88
1969	43	1.71	24.48	6.08	30.55
1968	61	2.40	21.36	8.85	30.22
1967	59	2.13	19.33	11.90	31.23
1966	49	1.94	17.85	10.11	27.96
1965	54	2.12	19.02	9.96	28.98
1964	44	1.71	15.13	12.49	27.63
1964-1970	49	1.94	19.44	9.48	28.92

Table: TABLE II Monthly summary of the results obtained in 1971 of the daily observations of the concentration of SMOKE by the volumetric method at the Public Services Building and at Snow Hill Police Station. The results obtained by means of the deposit gauge at Guildhall are included for comparison.

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TABLE II Monthly summary of the results obtained in 1971 of the daily observations of the concentration of SMOKE by the volumetric method at the Public Services Building and at Snow Hill Police Station. The results obtained by means of the deposit gauge at Guildhall are included for comparison.

Month	Concentration of Smoke (microgrammes per cubic metre)		Rainfall collected in the deposit gauge
	Public Services BuiIding	Snow Hill Police Station	Millimetres	Inches
	January	69	_	64	2.52
February	52	—	11	0.42
March	35	—	39	1.53
April	36	-	36	1.44
May	17	-	72	2.70
June	—	34	128	5.08
July	28	27	24	0.93
August	26	30	88	3.66
September	52	59	16	0.59
October	57	—	64	2.43
November	55	51	-	-
December	76	55	23	0.83
Averages
1971	46	43	51	2.01
1970	43	45	41	1.61
1969	54	60	43	1.71
1968	51	48	61	2.40
1967	50	50	54	2.13
1966	59	56	49	1.94
1965	70 (Golden Lane)	64	54	2.12
1964	88 (Golden Lane)	77	44	1.71
1964-1970	59	57	49	1.94

London's Pulse: Medical Officer of Health reports 1848-1972

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City of London 1971

Table: TABLE 1 Results obtained in 1971 of the monthly observations of rainfall and deposited matter by means of the deposit gauge at Guildhall.