『Abstract
　The geochemical characteristics of trace metals (As, Cr, Co, Cd, Cu, Mn, Ni, Pb, V and Zn) in PM10 in Wuhan, the biggest metropolitan in central China, as well as their sources and contributions were analyzed. As PM10 has been the principal contaminant of air in Wuhan for years, concentrations of trace metals were measured in PM10 using high-volume samplers at one urban (Hankou) and one industrial (Changqian) site in Wuhan between September 2003 and September 2004. Based on the results, PM10 in Wuhan is characterized by relatively high levels of As, Cd, Mn, Pb and Zn compared with other Asian cities. The time-series of these elements indicated that As, Cu and Zn at both sites have similar trends, whereas Pb levels showed different patterns due to different emission sources. factor analysis was applied to the datasets focusing on the apportionment of the mass of selected trace metals. Results indicate that Pb, Cd and As have a common source
(smelting) at both sites, whereas the sources of Ni vary from coal combustion and steel in Vhangqian to mineral and traffic in Hankou.

Keywords: PM10; Geochemistry; Statistic analysis; Time series』

Introduction
Materials and methods
　Sampling
　Sample analysis
　Data processing
Results and discussion
　Trace elements concentration levels
　Time-series of trace metals levels
　Factor analysis
　Source apportionment of selected elements
Conclusions
Acknowledgements
References