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Journal of Japan Society of Air Pollution
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, neutrondoi:10.11298/taiki1966.11.26 fatcat:t3bjfjym4fgnxgqfy4xtxplrra