Reply to Hopke and Dai: The correlation between PM_2.5 and combustion-derived water is unlikely driven by local residential coal combustion

Affiliations

• ¹ State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, 710061 Xi'an, China.
• ² Center for Excellence in Quaternary Science and Global Change, Chinese Academy of Sciences, 710061 Xi'an, China.
• ³ Key Laboratory of Aerosol Chemistry and Physics, Institute of Earth Environment, Chinese Academy of Sciences, 710061 Xi'an, China.
• ⁴ State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, 710061 Xi'an, China; jjcao@ieecas.cn.
• ⁵ Open Studio for Oceanic-Continental Climate and Environment Changes, Qingdao National Laboratory for Marine Science and Technology, 266237 Qingdao, China.
• ⁶ Department of Earth and Environmental Sciences, Xi'an Jiaotong University, 710049 Xi'an, China.
• ⁷ International Center for Isotope Effects Research, School of Earth Science and Engineering, Nanjing University, 210023 Nanjing, China.
• ⁸ Department of Geology and Geophysics, Louisiana State University, Baton Rouge, LA 70803.