中文摘要：

在大量文献调研的基础上,对正常天气下中国43个城市PM_（2.5）和26个城市PM_（10）中As、Cd、Cr、Cu、Ni、Pb和Zn的数据进行了归纳和分析,探讨中国城市PM_（2.5）和PM_（10）中重金属的总体分布及区域分布特征,并对今后的研究提出了建议。结果表明：1）我国对空气颗粒物中重金属的研究主要集中在PM_（2.5）和PM_（10）两种粒级;PM_（10）中各元素质量浓度均大于PM_（2.5）中元素质量浓度,但两者之间差异不显著;2）不同粒级颗粒物中重金属质量浓度区域分布不同,总体上PM_（2.5）中重金属质量浓度在我国华南、西北地区较高,西南地区最低,而PM_（10）中重金属质量浓度在华北、西北地区较高,西南地区较低;3）总体上,PM_（2.5）中重金属质量浓度表现为省会城市高于地级城市,而PM_（10）中重金属质量浓度表现为地级城市高于省会城市。今后可从不同粒级颗粒物中重金属含量分布特征及不同来源颗粒物粒径特征等方面开展更多的研究,为治理城市空气污染提供科学依据。

英文摘要：

This paper is inclined to study and present the national and regional distribution patterns of As,Cd,Cr,Cu,Ni,Pb and Zn in PM_（2.5）and PM_（10） emissions in the air in the country through an analysis and summarization of the statistics data from PM_（2.5）in43 cities and PM_（10） in 26 cities from the published statistics results in the scientific literatures concerned. Based on the above analysis,it has also proposed a scheme of the future research opportunities in the given field in the nation-wide scale. The results of our analysis indicate show that：（ 1） The statistics data has been mainly focused on the pollution of heavy metals in air particulate matters on PM_（2.5）and PM_（10）. The annual average emission concentration rates of the elements in PM_（2.5）tend to follow the descending order of Zn Pb Cu Cr As Ni Cd,with the average concentration distributions of 341 ng/m~3,119 ng/m~3,33. 6 ng/m~3,17. 0 ng/m~3,12. 8 ng/m~3,11. 9 ng/m~3 and 2. 13 ng/m~3,respectively. In the regard of the annual average emission concentration rates,the distribution order of heavy metals in PM_（10） has been found following the order of Zn Pb Cu Cr Ni As Cd,with their respective emission rates of 385 ng/m~3,161 ng/m~3,40. 6 ng/m~3,23. 2 ng/m~3,14. 6 ng/m~3,14. 4 ng/m~3 and 3. 15 ng/m~3,respectively. Though the concentration rates of heavy metals＇ emission in PM_（10） turn out to be higher than that in PM_（2.5）,the difference was not significant. The variety of concentration of heavy metals showed a sequential order as Ni Cr Cd Zn As Cu Pb in PM_（2.5）,and Zn Ni Cd Cr Cu As Pb in PM_（10）. Ni,Cd and Zn in PM_（2.5）and in PM_（10） were more affected by the geographic position of cities,while Pb was relatively less affected by the geographic position of cities.（ 2） Regional distribution of heavy metal differed with different size fraction of particle matters. In general,the concentration of heavy metals in PM_（2.5）was relatively higher in the southern and northwest of China