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79
A table setting out the monthly average and highest daily average for each
month of the concentration of smoke and sulphur dioxide as reoorded at these
stations is given on Page 21 of the Appendix.
During periods of heavy fog the volumetric smoke readings are taken at
three or four-hourly intervals and a record of the "smog" period built up.
These readings are of particular interest to the Department of Scientific and
Industrial Research who are engaged in determining why "smog" kills and what
it contains. The following average daily figures illustrate the increased
pollution occurring during the foggy weather period December 4th and 5th.
3rd December, 1957 24 hours 128.4 milligrams
4th „ „ 17 „ 275.8 „
4 th „ „ 5 „ 179.0 „
4th „ „ 3 „ 69.6 „
5th „ „ 16 „ 299.9 „
5th „ „ 5 „ 386.6 „
Smoke per 100 cubic
metres of air sampled
The 24 hour figure for December 6th was 66.9 milligrams.
The Volumetric Sulphur Dioxide readings, taken every 24 hours, show a
correspondingly heavy increase during this period -
3rd December, 1957 39.04 parts per 100 ml
4th December, 1957 77.4 „ „ „
5th December, 1957 72.9 „ „ „
6th December, 1957 25.3 „ „ „