Source apportionment of PM2.5 sulfate in Seoul, South Korea during winter and early spring (2017-2020), and the cause of sulfate reduction in Seoul during China's COVID-19 lockdown
Giyoon Lee1, Jinho Ahn2, Seung Myung Park3, Jonghan Moon4, Min Sub Sim4, Rokjin Park4, Joonyoung Ahn5, Jin-Soo Park5 and Hanna Choi6, (1)Seoul National University, Seoul, Korea, Republic of (South), (2)Seoul National University, School of Earth and Environmental Sciences, Seoul, South Korea, (3)NIER National Institute of Environmental Research, Incheon, Korea, Republic of (South), (4)Seoul National University, Seoul, South Korea, (5)NIER National Institute of Environmental Research, Climate and Air Quality Research, Incheon, South Korea, (6)Korea Institute of Geoscience and Mineral Resources, Groundwater department, Daejeon, South Korea
