Li Zhen, Yu Shaocai, Li Mengying, Chen Xue, Zhang Yibo, Li Jiali, Jiang Yapping, Liu Weiping, Li Pengfei, Lichtfouse Eric
Key Laboratory of Environmental Remediation and Ecological Health, Ministry of Education; Research Center for Air Pollution and Health, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310058 Zhejiang People's Republic of China.
College of Science and Technology, Hebei Agricultural University, Baoding, 071000 Hebei People's Republic of China.
Environ Chem Lett. 2022;20(1):59-69. doi: 10.1007/s10311-021-01314-8. Epub 2021 Oct 30.
Despite large decreases of emissions of air pollution during the coronavirus disease 2019 (COVID-19) lockdown in 2020, an unexpected regional severe haze has still occurred over the North China Plain. To clarify the origin of this pollution, we studied air concentrations of fine particulate matter (PM), NO, O, PM, SO, and CO in Beijing, Hengshui and Baoding during the lockdown period from January 24 to 29, 2020. Variations of PM composition in inorganic ions, elemental carbon and organic matter were also investigated. The HYSPLIT model was used to calculate backward trajectories and concentration weighted trajectories. Results of the cluster trajectory analysis and model simulations show that the severe haze was caused mainly by the emissions of northeastern non-stopping industries located in Inner Mongolia, Liaoning, Hebei, and Tianjin. In Beijing, Hengshui and Baoding, the mixing layer heights were about 30% lower and the maximum relative humidity was 83% higher than the annual averages, and the average wind speeds were lower than 1.5 m s. The concentrations of NO , SO , NH , organics and K were the main components of PM in Beijing and Hengshui, while organics, K, NO , SO , and NH were the main components of PM in Baoding. Contrary to previous reports suggesting a southerly transport of air pollution, we found that northeast transport caused the haze formation.
The online version contains supplementary material available at 10.1007/s10311-021-01314-8.
尽管2020年新型冠状病毒肺炎（COVID-19）封锁期间空气污染排放大幅下降，但华北平原仍意外出现了区域性严重雾霾。为了弄清这种污染的来源，我们研究了2020年1月24日至29日封锁期间北京、衡水和保定的细颗粒物（PM）、一氧化氮（NO）、臭氧（O₃）、PM₂.₅、二氧化硫（SO₂）和一氧化碳（CO）的空气浓度。还研究了无机离子、元素碳和有机物中PM成分的变化。使用HYSPLIT模型计算后向轨迹和浓度加权轨迹。聚类轨迹分析和模型模拟结果表明，严重雾霾主要是由内蒙古、辽宁、河北和天津东北部不停工的工业排放造成的。在北京、衡水和保定，混合层高度比年平均值低约30%，最大相对湿度比年平均值高83%，平均风速低于1.5米/秒。在北京和衡水，NO₃⁻、SO₄²⁻、NH₄⁺、有机物和钾（K）的浓度是PM的主要成分，而在保定，有机物、K、NO₃⁻、SO₄²⁻和NH₄⁺是PM的主要成分。与之前报道的空气污染南风输送情况相反，我们发现东北风输送导致了雾霾形成。
在线版本包含可在10.1007/s10311-021-01314-8获取的补充材料。
