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99
Microgrammes
Smoke
per cubic metre
SO2
January 60 121
February 24 74
March 41 129
April 29 100
May 21 63
June 17 54
July 16 52
August 15 57
September 30 81
October 37 86
November 63 158
December 63 105
Yearly average for 1966 :
Smoke = 35 MG/Cu.M.
SO2 = 90 MG/Cu.M.
The Warren Spring Laboratory has reported that in recent
years in the London area, as a result of clean air policy, there has
been a marked reduction in the concentration of smoke and a
decrease in the sulphur dioxide concentration.
PREVENTION OF DAMAGE BY PESTS ACT, 1949
RODENT CONTROL
Thousands of tons of the nation's food supply are lost or have
to be condemned annually due to the consumption and contamination
by rats and mice.
The risk of undetected contamination of food is also involved
and may result in the infection of human beings.
For these reasons, although there are powers in the Act to
require the destruction of rats or mice by the occupier or the
owner of the land which they infest, most Local Authorities
operate a free rodent destruction service in private premises and
charge only an economic fee for disinfesting business premises.
The Council's sewerage system is "tested" in the spring with
unpoisoned bait and the "take" of this bait indicates where it is
necessary to lay poison. A further poisoning treatment, based on
the results of the earlier one, is carried out in the autumn. The
results obtained from the treatments this year indicate a comparatively
slight infestation of the sewers.
With regard to surface infestations 3,097 premises were
visited and treated as a result of complaints, 111 of these being
for mice.