Jie Tian is an Associate Researcher at the Institute of Earth Environment, Chinese Academy of Sciences. He is a member of the Youth Innovation Promotion Association of the Chinese Academy of Sciences and was selected as a Young Scholar in the western region (category B). His main research interests are the physical and chemical characteristics, optical properties, and source analyses of ambient atmospheric and source emission aerosols, especially impact assessments of the environmental and climate effects of brown carbon and black carbon aerosols. He received his Ph.D. from the Institute of Earth Environment, Chinese Academy of Sciences, in 2017. He was a Postdoctoral Fellow at Xi’an Jiaotong University from 2017 to 2019. In 2018, he was a Visiting Scholar at the University of Nevada, Las Vegas. From 2019 to 2022, he worked as an Assistant Researcher at the Institute of Earth Environment, Chinese Academy of Sciences, and became an Associate Researcher in 2022. He serves as a Guest Editor of this Toxics Special Issue and a Review Editor of Frontiers in Environmental Science. His projects include the National Natural Science Foundation Youth Project, the Shaanxi Province Natural Science Basic Research Program Youth Project, the Light of the West of the Chinese Academy of Sciences, and the China and Shaanxi Province Postdoctoral Fund.