Zhao Jiang-Wei, Nie Sai-Sai, Yu Yu-Jie, Wang Shuai, Cui Jian-Sheng, Wang Wei, Ren Xiao-Wei, Zhu Shuo
Hebei Province Ecology Environmental Monitoring Center, Shijiazhuang 050037, China.
School of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China.
Huan Jing Ke Xue. 2023 Sep 8;44(9):4775-4784. doi: 10.13227/j.hjkx.202208250.
The "14 Five-Year Plan" period is the key stage for southern Hebei cities (Shijiazhuang, Xingtai, and Handan) to be removed from the bottom ten of the Air Quality Composite Index. The hourly ozone (O) data of 15 country-controlled monitoring stations in the southern cities of Hebei Province from April to October 2020, hourly data of three volatile organic compound (VOCs) supersites, and the meteorological data of the same period were used for analysis, combined with the spatiotemporal succession, O formation potential (OFP), backward trajectory modeling, and spatial statistical modeling. The results showed the following:firstly, the temporal variations in O in southern cities of Hebei Province from April to October presented an inverted "U" shape, and the spatial distribution was high in the south and low in the north. O pollution was the most serious in June, with Xingtai (233.8 μg·m)>Handan (225.2 μg·m)>Shijiazhuang (224.8 μg·m). O was positively correlated with temperature and wind speed and negatively correlated with humidity and VOCs; furthermore, the (TVOC) from April to October followed the order of Xingtai (274 μg·m)>Shijiazhuang (266 μg·m)>Handan (218 μg·m). The total OFP of alkenes and aromatics accounted for more than half; moreover, the trajectory of O pollution in southern cities of Hebei Province showed spatial directionality and relevance. The highest mass concentration of O (198.92 μg·m) was in the trajectory from Shijiazhuang to Xingtai, and the highest frequency of O pollution was in the trajectory from Handan to Xingtai. Moreover, the transmission contributions of Ofrom Xingtai to Shijiazhuang agglomerations were high (27.39%), and Handan played a significant role in the transmission contribution of O to Xingtai (32.76%).
“十四五”时期是冀南城市（石家庄、邢台、邯郸）摆脱空气质量综合指数排名后十位的关键阶段。利用2020年4月至10月河北省南部城市15个国家控制监测站点的臭氧（O₃）小时数据、3个挥发性有机物（VOCs）超级站点的小时数据以及同期气象数据，结合时空演变、O₃生成潜势（OFP）、后向轨迹模型和空间统计模型进行分析。结果表明：一是河北省南部城市4月至10月O₃的时间变化呈倒“U”形，空间分布为南高北低。6月O₃污染最严重，邢台（233.8μg·m⁻³）＞邯郸（225.2μg·m⁻³）＞石家庄（224.8μg·m⁻³）。O₃与气温、风速呈正相关，与湿度、VOCs呈负相关；此外，4月至10月总挥发性有机物（TVOC）浓度排序为邢台（274μg·m⁻³）＞石家庄（266μg·m⁻³）＞邯郸（218μg·m⁻³）。烯烃和芳烃的OFP总量占比过半；而且，河北省南部城市O₃污染轨迹呈现空间方向性和关联性。O₃质量浓度最高值（198.92μg·m⁻³）出现在从石家庄到邢台的轨迹中，O₃污染频次最高出现在从邯郸到邢台的轨迹中。此外，邢台对石家庄城市群O₃的传输贡献较高（27.39%），邯郸对邢台O₃的传输贡献作用显著（32.76%）。
