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49
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 the table below. 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.
Roof— 207 Lavender Tooting Queen Mary's
Station Municipal Hill Library Hospital
Buildings Battersea Roehampton
Month—1967 Smoke SO2 Smoke SO2 Smoke SO2 Smoke SO2
January 160 361 182 341 179 246 91 121
February 146 345 160 304 162 261 120 149
March 231 302 141 210 120 191 91 181
April 124 341 92 261 102 221 60 143
May 82 181 76 147 92 146 51 96
June 70 214 60 102 62 121 46 81
July 61 202 51 76 52 66 49 71
August 70 141 39 70 56 83 62 63
September 72 206 140 122 73 210 66 107
October 168 302 172 261 129 242 131 170
November 204 314 206 282 192 241 176 220
December 211 240 214 317 209 271 140 174
Average 133 262 128 208 119 191 90 131