This study investigated the spatiotemporal variation,chemical characteristics,source apportionment,and their contribution for clustered transportation routes of atmospheric fine particle(PM2.5)around the Taiwan Strait.Atmospheric PM2.5was simultaneously collected at three selected sampling sites around the Taiwan Strait in the years of 2013-2015.Field sampling resultsshowed that atmospheric PM2.5 concentrations varied with the clustered transportation routes.The concentrations of PM2.5 blown from the north were generally higher than thosefrom the south.Chemical analysis results showed that the most abundantchemical composition were secondary inorganic aerosols(SO42-,NO3-,and NH4+),natural crustal materials(Mg,Ca,AL,K,and Fe),and anthropogenic metals(Pb,Ni,and Zn).Moreover,high OC/EC ratios of PM2.5were commonly observed at the west-sidesite located at the downwind of major stationary sources.Furthermore,primary organic carbons(POC)were always higher than secondary organic carbons(SOC)on both sidesof the Taiwan Strait.The concentrations of chemical species from the trajectory NWW(southern China)were much higher than other trajectories.Integrating the results obtained from receptor modeling and backward trajectory simulation indicated that high PM2.5concentrations were transported from North China,the eastern coast of China,Korea Peninsula,and South Japan.It was mainly attributed to the combination of the relatively elevated emissions from coal burningfor space heating,and long-range transport(LRT)of PM2.5 from upwind sources.The source apportionment of secondary aerosols were in order of east-side site > offshore site > west-side site,suggesting that aged secondary particles could be formed during the transportation process by long-range and duration toward the east-side siteof Taiwan Strait and the offshore site.