@data{10.12072/ncdc.sdzraw.db2942.2023,
title = {Daily  Average Value of Sulfur Dioxide at Shangdianzi Atmospheric Background Station in Beijing from 2004 to 2005},
author = {Zhang Xiaochun and Quan Weijun},
url = {http://www.ncdc.ac.cn/portal/metadata/06ef5ca0-0d1d-11e6-af40-5cc5d45ad3ae},
cstr = {11738.11.ncdc.SDZRAW.2020.17},
doi = {10.12072/ncdc.sdzraw.db2942.2023},
journal = {National Cryosphere Desert Data Center},
publisher = {National Cryosphere Desert Data Center(www.ncdc.ac.cn)}
}