Characteristics and health risks of parent, alkylated, and oxygenated PAHs and their contributions to reactive oxygen species from PM2.5 vehicular emissions in the longest tunnel in downtown Xi'an, China

Yali Lei, Zexuan Wang, Hongmei Xu, Rong Feng, Ningning Zhang, Yue Zhang, Wei Du, Qian Zhang, Qiyuan Wang, Lijuan Li, Linli Qu, Steven Sai Hang Ho, Zhenxing Shen, Junji Cao