@article {17859,
	title = {Seasonal variation of carcinogenic heavy metals in PM2.5 and source analysis in Beijing},
	journal = {Environmental Science},
	volume = {35},
	year = {2014},
	pages = {411-417},
	abstract = {Durinf April, July, October 2009 and January 2010, daily (24-h average) PM2.5 sample\&nbsp;were collected at urban sites in Beijing and 29 metal elements were analized by the ICP-MS.},
	author = {J. Tao and R.J. Zhang and J.C. Duan and J.S. Jing and Zhu, L. H. and Chen, Z. M. and Y. Zhao and Cao, J. J.}
}
