Diameter Distribution of Particles from Fugitive Emission Sources in Beijing

The mass percentage of different diameter particles from fugitive emission sources was identified in applying real density and YFJ centrifugal dust grade instrument in Beijing.The results showed the diameter distribution of particles from 0 to 100 μm.As for inhalable particles from urban dust,it included the maximum mass percentage(16.46%),the minimum meso-diameter D_50(34μm),and the most fine particles.The distribution characteristics of soil dust from mountain,river and farmland were similar.As for road dust,the fine particles from speedway and circle road were much than from main road and non-main road.