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
Fine particulate matter (PM2.5 ) causes millions of premature deaths each year worldwide. Oxidative potential (OP) has been proposed as a better metric for aerosol health effects than PM2.5 mass concentration alone. In this study, we report for the first time online measurements of PM2.5 OP in wintertime Beijing and surroundings based on a dithiothreitol (DTT) assay. These measurements were combined with co-located PM chemical composition measurements to identify the main source categories of aerosol OP. In addition, we highlight the influence of two distinct pollution events on aerosol OP (spring festival celebrations including fireworks and a severe regional dust storm)...
April 13, 2024: Science of the Total Environment