Comparing the hysteresis parameters of dust, topsoil and dust storm samples to natural materials such as Chinese paleosol and loess, we figure out that the dust samples from urban were quite different from the natural material samples. 尘土、表土、沙尘暴样品与中国黄土、古土壤的磁滞参数对比显示,北京市区尘土样品的磁性参数与自然来源的颗粒物显著不同,尘土主要反映了城市工业和交通污染产生的磁性颗粒特征。
The dust concentration, carbon dioxide concentration and noise figure in urban green space were higher than the suburbs. 城区绿地的PM10浓度、CO2浓度、噪声指数在两季都要高于郊区。