【摘要】 通过对兰州市城关区1999年春季大气气溶胶的监测，分析了该地区TSP和可吸入颗粒 物的质量浓度及可吸入颗粒物的粒径分布规律，并与1993年春季同一时期测得的数 据进行了比较，结果表明：该地区TSP的质量浓度日变化呈双峰型；近几年可吸入颗粒物的 粒径分布有了明显变化，粗粒子呈下降趋势，细粒子呈上升趋势；气象因子对TSP质量浓度 的影响十分明显.更多还原

【Abstract】 The pollution of aerosols in the Chengguan District of Lanzhou City in spring of 1999 was monitored. Analyzes of TSP and grain-size distribution of d ust with a comparison with the data of 1993 show that the daily variation of TSP pre sen ts a curve of bi-peaks, and the grain-size distribution of floating dust chang ed great ly in recent years. Climatic conditions have a great effect on the concentration s of TSP.更多还原