@article {21475,
	title = {Introduction to the special issue {\textquotedblleft}In-depth study of air pollution sources and processes within Beijing and its surrounding region (APHH-Beijing){\textquotedblright}},
	journal = {Atmospheric Chemistry and Physics},
	year = {2019},
	pages = {7519-7546},
	url = {https://www.atmos-chem-phys.net/19/7519/2019/},
	author = {ZB Shi and Vu T and S Kotthaus and Harrison, R. M. and S Grimmond and SY Yue and T. Zhu and J. Lee and YQ Han and M Demuzere}
}
