TY - JOUR A1 - He, K. A1 - Zhao, Q. A1 - Ma, Y. A1 - Duan, F. A1 - Yang, F. 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. Discuss. J1 - ACPD VL - 11 IS - 9 SP - 25557 EP - 25603 Y1 - 2011/09/13 PB - Copernicus Publications SN - 1680-7375 UR - http://www.atmos-chem-phys-discuss.net/11/25557/2011/ L1 - http://www.atmos-chem-phys-discuss.net/11/25557/2011/acpd-11-25557-2011.pdf DO - 10.5194/acpd-11-25557-2011 ER -