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TABLE 11 — Smoke concentrations by the volumetric method.
In 1960 the average concentrations of smoke at all four stations were below those recorded for
the average of the previous five years. There was a marked improvement at Bishopsgate compared
with|the three previous years which may well be due to the increasing use of electric and diesel
locomotives at Liverpool Street Station.
TABLE 111 — Sulphur measurements by the volumetric and lead peroxide methods.
It will be seen from the Table that the average concentrations of sulphur pollution were less
than those recorded in 1959, but there was little change from the average of the years 1955-1959.
Only at the Cloak Lane station was there shown to be a slight increase. A "smog" incident is
likely to occur when the mean level for London attains a daily value of 40 parts of sulphur
dioxide per 100 million parts of air. This daily value was exceeded in the City on only two days
in 1960 — on December 17th and January 7th at the Golden Lane, and Bishopsgate and Cloak Lane
stations, when the concentrations were 41.8 at Bishopsgate on December 17th, and 43.7, 54.4
and 60.3 at Golden Lane, Bishopsgate and Cloak Lane.
By the lead peroxide method sulphur pollution at Golden Lane showed a slight decrease
when compared with 1959, but there was a slight increase when compared with the average of the
previous five years. Similar comparisons of the measurements recorded in Finsbury Circus
showed a decrease in sulphur pollution.