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TABLE III Monthly summary of the results obtained in 1971 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
Building
Snow Hill
Police Station
Millimetres Inches
January 401 — 64 2.52
February 353 — 11 0.42
March 267 — 39 1.53
April 282 — 36 1.44
May 200 — 72 2.70
June — 212 128 5.08
July 141 132 24 0.93
August 146 91 88 3.66
September 240 177 16 0.59
October 277 194 64 2.43
November 308 311 — —
December 354 361 23 0.83
Averages
1971 270 211 51 2.01
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 284 328 49 1.94
1965 286 (Golden Lane) 341 54 2.12
1964 316 (Golden Lane) 383 44 1.71
1964-1970 286 306 49 1.94
RODENT CONTROL
Work involved in implementing the Prevention of Damage by Pests Act, 1949, can be classified
under two headings:
(a) The inspection of premises and the offer of advice on treatment of premises which
are infested.
(b) Control work in the sewers.

Efforts were made to establish sources of infestation and advice given and "follow up"
visits paid to check on the effectiveness of treatment.
(b) Destruction of rats in sewers
Three direct treatments were carried out in March, September and December, using Ruskarsenic
(in March), Racumin 57 (in September) and Rusk-arsenic (in December).
In June, baiting treatments were carried out and where takes were recorded poison baits,
using rusk-zinc phosphide, were applied. This test-baiting showed a decline compared with
1970. All the sewer treatments were carried out in good dry-weather conditions.
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