A study of the impurity in the air involves the measurement of quantity as well as the provision of means whereby the nature of the suspended matter can be examined. The object which the author had in view in making this investigation was to provide some simple and effective method for examining the quantity and nature of suspended dust, and its relation to visibility, fumes from industrial processes, dust produced in mines, fogs such as are experienced in our larger cities, and generally in the hope of throwing some light on problems which are concerned with the presence of fine suspended impurities in the air. This paper is devoted chiefly to a description of a method of trapping for examination the suspended matter in the air, and the application of the method, and also to a discussion of the relation between dust and visibility. The work described by the author was carried out for the Advisory Committee on Atmospheric Pollution. This Committee has as its function the obtaining and consideration of data upon atmospheric impurities. The methods adopted fall into two distinct groups—the measurement and examination of:— (a) Matter deposited from the air; and (b) Matter suspended in the air.
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J. S. Owens (1922) studied this question.