View report page

42
flue gases which the chimney is expected to emit as a function of
the maximum rate of emission of sulphur dioxide. This is not
applicable to all chimneys and affects only:—
(a) chimneys of industrial boiler plant of maximum continuous
rating greater than approximately 650 lb. steam/hr. and not
exceeding 450,000 lb. steam/hr. or
(b) to chimneys serving furnaces burning fuel at a maximum
rate greater than approximately 100 lb./hr. of coal or
50 lb./hr. of oil, and not exceeding 50,000 lb./hr. of coal
or 30,000 lb./hr. of oil.
The method of calculation advised by the Minister is to be
regarded more as a guide rather than a mathematically precise
way of reaching a final decision on chimney height and is open
to modification in the light of particular local circumstances.
Discussions have taken place in the past with other local authorities
in an endeavour to arrive at an acceptable standard for the
inner London areas.
Measurement of Atmospheric Pollution
Daily readings of the concentration of smoke and sulphur
dioxide (S02) in the atmosphere were continued during the year
at the four stations throughout the Borough where recording
apparatus has been installed. A record of these readings for the
year under review is given in Table 1 and details of smoke and S02
concentration during the year is shown in Table 2. The readings
are taken by members of the staff of the Department who pass the
information to the Department of Scientific and Industrial Research
for collation with data received from authorities all over the
country.