In one month, dustfall can reach as much as 17kg per square kilometre.
在一个月的时间里，每平方公里差不多要落下17kg的灰尘。
2
The mineral composition and morphology of atmospheric dustfall serve as important criteria in identifying pollution sources.
大气降尘矿物成分和形貌特征是判别污染物来源的重要标志。
3
The geography information system (GIS) technology was applied to deal with the pollution state of atmospheric dustfall in Jiaozuo City of Henan Province.