Atmospheric levels and cytotoxicity of polycyclic aromatic hydrocarbons and oxygenated-PAHs in PM2.5 in the Beijing-Tianjin-Hebei region - Xinyi Niu; Kin Fai Ho; Qiyuan Wang; Junji Cao; Jian Sun; Zhuzi Zhao; Yu Huang; Yaqing Zhou; Steven Sai Hang Ho (Environmental Pollution, 2017)