The evolution trend and typical process characteristics of atmospheric PM2.5 and O3 pollution in Beijing from 2013 to 2020 - Z. Zhang; Hu, M.; Shang, D.; Xiao, Y.; Hu, S.; Y. Qiu; Xu, N.; Zong, T.; Zhao, G.; Tang, L.; Guo, S.; S. Wang; et al. (Kexue Tongbao/Chinese Science BulletinKexue Tongbao/Chinese Science Bulletin, 2022)