@article {40878,
	title = {Rapid transition in winter aerosol composition in Beijing from 2014 to 2017: response to clean air actions},
	journal = {Atmospheric Chemistry and Physics},
	volume = {19},
	number = {17},
	year = {2019},
	pages = {11485-11499},
	isbn = {1680-7324},
	author = {Li, Haiyan and Jing Cheng and Qiang Zhang and Zheng, Bo and Zhang, Yuxuan and Zheng, Guangjie and Kebin He}
}
