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An immense amount of dust is daily inhaled by those living in a great city. No additional evidence on the point is needed, but the reported experiments in a New York hotel are interesting. This hotel has a ventilating system by which fresh air is supplied to each room after having been filtered through fine cheesecloth screens. It is reported that a barrel of dust was thus filtered from the air in the course of a week. It is presumed that the air was secured from a point where the least dust already existed so that without doubt a far greater amount circulated at other places—for example, on the street level where traffic was passing by. In cleaning the hotel pneumatic suction appliances are used, and in sweeping the halls and rooms in this hygienic manner, two and a half barrels of dust, it is said, were collected during one
DUST IN CITY AIR.. JAMA. 1904;XLIII(18):1314. doi:10.1001/jama.1904.02500180044011