Hazy Weather-Induced Variation in Environmental Behavior of PCDD/Fs and PBDEs in Winter Atmosphere of A North China Megacity

Environmental Science & Technology
Rong CaoJiping Chen

Abstract

Haze is a serious pollution problem during the wintertime in North China. In this study, we investigated how the periodic cycle of winter haze events affect the environmental behaviors of two typical persistent organic pollutants, namely, polychlorinated dibenzo- p-dioxins and dibenzofurans (PCDD/Fs) and polybrominated diphenyl ethers (PBDEs), in the atmosphere of a typical megacity, Beijing. The average atmospheric concentrations of the total di- to octa-CDD/Fs (∑PCDD/Fs: 378.0 pg/m3) and the total mono- to nona-BDEs (∑9hPBDEs: 166.5 pg/m3) during haze episodes increased by 3.6-fold and 1.9-fold compared with those during the nonhaze periods, respectively; and their concentrations both linearly increased with PM2.5 levels and decreased as a power function of the atmospheric boundary layer height. The elevated concentrations could be clearly attributed to the vertically sinking motion of airflow in the midlower troposphere. When a haze event occurred, the partitioning rate of PCDD/Fs and PBDEs into particles was reduced; the largest fraction of the particle-bound ∑PCDD/Fs was shifted from ultrafine particles to accumulation mode particles; and a steady-state model (Li-Ma-Yang model) satisfactorily described the gas-particle par...Continue Reading

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Citations

Mar 24, 2021·Environmental Science & Technology·Shizhen ZhaoGan Zhang
Apr 23, 2021·Journal of Hazardous Materials·Di WuJianmin Chen
Sep 24, 2021·Environmental Science & Technology·Yanhao ZhangZongwei Cai
Nov 8, 2021·The Science of the Total Environment·Fu-Jie ZhuWei-Wei Song
Jan 11, 2020·The Science of the Total Environment·Yi-Fan LiKurunthachalam Kannan

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