TY - JOUR A1 - He, K. A1 - Zhao, Q. A1 - Ma, Y. A1 - Duan, F. A1 - Yang, F. A1 - Shi, Z. A1 - Chen, G. T1 - Spatial and seasonal variability of PM2.5 acidity at two Chinese megacities: insights into the formation of secondary inorganic aerosols JO - Atmos. Chem. Phys. J1 - ACP VL - 12 IS - 3 SP - 1377 EP - 1395 Y1 - 2012/02/06 PB - Copernicus Publications SN - 1680-7324 UR - http://www.atmos-chem-phys.net/12/1377/2012/ L1 - http://www.atmos-chem-phys.net/12/1377/2012/acp-12-1377-2012.pdf DO - 10.5194/acp-12-1377-2012 ER -