TY - JOUR A1 - Chen, Z. A1 - Chen, D. A1 - Wen, W. A1 - Zhuang, Y. A1 - Kwan, M.-P. A1 - Chen, B. A1 - Zhao, B. A1 - Yang, L. A1 - Gao, B. A1 - Li, R. A1 - Xu, B. T1 - Evaluating the “2+26” regional strategy for air quality improvement during two air pollution alerts in Beijing: variations in PM2.5 concentrations, source apportionment, and the relative contribution of local emission and regional transport JO - Atmos. Chem. Phys. J1 - ACP VL - 19 IS - 10 SP - 6879 EP - 6891 Y1 - 2019/05/23 PB - Copernicus Publications SN - 1680-7324 UR - https://acp.copernicus.org/articles/19/6879/2019/ L1 - https://acp.copernicus.org/articles/19/6879/2019/acp-19-6879-2019.pdf DO - 10.5194/acp-19-6879-2019 ER -