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中文摘要：
城市的环境问题具有增加担心。Lanzhou 是在西北中国的一个大工业城市。代表不同时间、空间的规模的街灰尘样品为磁性学习被收集。磁性的大小在 Lanzhou 街灰尘显示磁性的矿物质的高集中，由伪单人赛统治了领域(PSD ) 磁铁矿。磁性的材料的集中在冬季和春天显然高，在秋天低。同样，与重工业，集中的居住发展，和车辆的交通联系的更高的集中从人为、生来的来源建议磁性的材料的混合贡献。chi (如果) 并且 SOFT% 是在街灰尘在磁性之中表示季节的差别的有效磁性的参数，为监视街灰尘的方便、节俭的方法污染。
英文摘要：
Urban environmental problems are of increasing concern. Lanzhou is a large industrial city in Northwest China. Street dust samples representing different temporal and spatial scales were collected for magnetic properties study. Magnetic measurements indicate a high concentration of magnetic minerals in Lanzhou street dust, dominated by pseudo-single domain （PSD） magnetite. The concentration of magnetic materials is distinctly high in winter and spring, low in autumn. Similarly, higher concentrations associated with heavy industry, concentrated residential development, and vehicular traffic suggest mixed contributions of magnetic material from both anthropogenic and natural sources. XIf and SOFT% are effective magnetic parameters that denote seasonal differences among magnetic properties in street dust, convenient and economical methods for monitoring street dust pollution.
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