Size distributions of airborne particulate matter and filtration characteristics of air filter

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The airborne particulate matters were collected using Andersen impactors before and after an air filter placed on the 27th floor of a building at downtown Yokohama. Filtration characteristics of the filters were obtained by measuring the particle size distributions on weight basis, and simultaneously, neutron activation analysis method was applied to determine the size distributions for trace elements.<BR>The size distribution curve of the particulates has two peaks: one of "coarse particles" at 4μm and the other of "fine particles" at smaller than 0.5μm. On the other hand, the size distribution curves for elements were classified to three typical patterns. The coarse particles ware removed by the hi-efficiency filter, but the fine particles were little removed. The fine particles were remoed about half by the charcoal filter.<BR>Removal efficiency of trace element by the air filter depends on the size distribution of each element. Almost all of the coarse particles which could be originated from the ground can be ramoved by the filter, but the fine particles probably originated from combustion sources are hardly removed.
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