[Spatial dispersion laws of fugitive dust from construction sites].

Dust fall was selected as a monitored index of fugitive dust from construction sites. The vertical dispersion law of fugitive dust was studied nearby construction site's boundary by monitoring the concentration variation of dust fall at different heights from 1.5 meters to 4.1 meters. The horizontal dispersion law of fugitive dust was studied along different distance between monitoring points and construction site from 0 meters to 210 meters. We gained the vertical and horizontal dispersion models of fugitive dust by regressing measurement date. The results showed that the concentration of relative dust fall from construction site was proportional to second power of monitoring height, and relative dust fall at uniform height and direction was also proportional to second power of level distance between monitoring points and construction site. The vertical and horizontal dispersion constants are mainly affected by construction activity and natural condition.