Major source categories of PM2.5 oxidative potential in wintertime Beijing and surroundings based on online dithiothreitol-based field measurements

Rico K.Y. Cheung; Lu Qi; Manousos I. Manousakas; Joseph V. Puthussery; Yan Zheng; Theodore K. Koenig; Tianqu Cui; Tiantian Wang; Yanli Ge; Gaoyuan Wei; Yu Kuang; Mengshuang Sheng; Zhen Cheng; Ailin Li; Zhiyu Li; Weikang Ran; Weiqi Xu; Renjian Zhang; Yuemei Han; Qiyuan Wang; Zifa Wang; Yele Sun; Junji Cao; Jay G. Slowik; Kaspar R. Dällenbach; Vishal Verma; Martin Gysel-Beer; Xinghua Qiu; Qi Chen; Jing Shang; Imad El-Haddad; André S.H. Prévôt; Robin L. Modini