Occurrence, evolution and degradation of heavy haze events in Beijing traced by iodine-127 and iodine-129 in aerosols
a State Key Laboratory of Loess and Quaternary Geology, Shaanxi Key Laboratory of Accelerator Mass Spectrometry Technology and Application, Xi'an AMS Center, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China
b Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
c Department of Environmental Engineering, Technical University of Denmark, Risø Campus, Roskilde 4000, Denmark
d Xi'an Institute for Innovative Earth Environment Research, Xi'an 710061, China
e CAS Center for Excellence in Quaternary Science and Global Change, Xi'an 710061, China
f Open Studio for Oceanic-Continental Climate and Environment Changes, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qiangdao 266061, China
g University of Chinese Academy of Sciences, Beijing 100049, China
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