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Measurement of Atmospheric Pollution
The Council maintains Deposit Gauges and Lead Dioxide Candles at Birkbeck
Avenue, Greenford, and at Longfield Depot at the rear of the Town Hall. A third set
of instruments at Greenford Green Health Clinic was removed at the end of August.
These gauges and candles provide information of local interest only and serve to
indicate the level of pollution in the immediate areas concerned. The deposit bowls and
candles are changed monthly and the results are determined by a private analyst.
In addition, the Council also maintains three sets of equipment which provide
daily measurements of smoke and sulphur dioxide by the volumetric system. These
are located at the Town Hall, at Eliots Green Grammar School and at Walpole
Grammar School. The results obtained from these instruments are submitted to the
Warren Spring Laboratory of the Department of Scientific and Industrial Research
and form part of the National Survey of Atmospheric Pollution.
The tables and graphs in the following pages give details of the monthly results
from the deposit gauges and lead dioxide candles, and the monthly average, which is
the means of the "daily average" figures for smoke and sulphur dioxide, obtained
from the volumetric apparatus.
The photographs of the deposit gauge, the lead dioxide candle, and the daily
volumetric apparatus, which appear on the graphs, are 'Crown Copyright' and are
published by permission of the Director of Warren Spring Laboratory of the Department
of Scientific and Industrial Research.

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