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57
pollution of the air arises from the domestic chimney and emphasises
the need for domestic smoke control.
Deposit Gauges
Measurement of heavier pollution such as grit and dust by
using the deposit gauges was continued at Barking Park, Greatfields
Park, Parsloes Park and Thames View Estate.
The graph on Page 62 shows the variation in the pollution
from month to month.
This difference does not necessarily reflect a comparable
difference in grit and dust discharged to the air although it is
bound to be somewhat less in the summer than in the winter.
Climatic conditions however have an effect on the amount of
grit and dust which falls to the ground.
On warr clear days upward air currents would tend to carry
pollution to the upper atmosphere and so bring about greater dispersion
than occurs in the winter when pollution is brought down
by tain and lack of upward air currents.
Record of Chimney Observations carried out during 1960
Observations