[Report of the Medical Officer of Health for London, City of ] page 20

City of London 1970

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

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Table: TABLE II Monthly summary of the results obtained in 1970 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 1970 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 Building	Snow Hill Police Station	Mi 11 imetres	Inches
	January	71	89	64	2.50
February	47	68	46	1.81
March	49	64	48	1.90
April	38	47	41	1.62
May	39	41	15	0.61
June	30	35	8	0.32
July	22	33	24	0.94
August	29	59	68	2.70
September	35	—	24	0.96
October	52	—	14	0.55
November	45	65	108	4.27
December	58	62	28	1.09
Averages
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

Table: TABLE III Monthly summary of the results obtained in 1970 of the measurement of SULPHUR DIOXIDE 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 III Monthly summary of the results obtained in 1970 of the measurement of SULPHUR DIOXIDE 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 SO2 (microgrammes per cubic metre)		Rainfall collected in the deposit gauge
	Public Services Bui Iding	Snow Hill Police Station	Millimetres	Inches
	January	332	450	64	2.50
February	310	410	46	1.81
March	378	391	48	1.90
April	302	319	41	1.62
May	198	191	15	0.61
June	173	216	8	0.32
July	132	138	24	0.94
August	146	169	68	2.70
September	242	—	24	0.96
October	280	—	14	0.55
November	342	325	108	4.27
December	357	374	28	1.09
Averages
1970	270	249	41	1.61
1969	299	287	43	1.71
1968	277	263	61	2.40
1967	271	292	54	2.13
1966		328	49	1.94
1965	286(Golden Lane)	341	54	2.12
1964	3 l6(Golden Lane)	383	44	1.71
1964-1970	286	306	49	1.94

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City of London 1970

Table: TABLE III Monthly summary of the results obtained in 1970 of the measurement of SULPHUR DIOXIDE 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.