@Article{acp-17-12941-2017,
AUTHOR = {Huang, X. and Liu, Z. and Liu, J. and Hu, B. and Wen, T. and Tang, G. and Zhang, J. and Wu, F. and Ji, D. and Wang, L. and Wang, Y.},
TITLE = {Chemical characterization and source identification of PM$_{2.5}$ at
multiple sites in the Beijing--Tianjin--Hebei region, China},
JOURNAL = {Atmospheric Chemistry and Physics},
VOLUME = {17},
YEAR = {2017},
NUMBER = {21},
PAGES = {12941--12962},
URL = {https://acp.copernicus.org/articles/17/12941/2017/},
DOI = {10.5194/acp-17-12941-2017}
}