[Characteristics of fugitive dust pollution in different construction phases].

More than forty construction sites were selected as experimental fields in urban districts and near suburbs of Beijing. Fugitive dust from construction sites was monitored by dust fall. The characteristics of fugitive dust pollution in different construction phases were studied. The frequency distribution of relative dust fall date in different construction phases were statistically analyzed, and the results show that fugitive dust pollution in earthwork phase is more serious than those in structure and decoration phases. There are higher probabilities of high strength fugitive dust pollution in earthwork and decoration phases comparing with structure phase, and the probabilities of relative dust fall which is more than 50 t/(km2 x 30 d) are 16%, 16% and 3% respectively. Different construction phases all comply with the laws that fugitive dust pollution strength in spring is bigger than summer,autumn and winter obviously, and winter is bigger than summer and autumn appreciably. There are obvious relation of fugitive dust pollution strength in different construction phases, and the ratio of pollution strength in earthwork, structure and decoration phases equals to 100:67:87.