College of New Energy and Environment, Jilin University, Changchun 130012, China.
Int J Environ Res Public Health. 2020 Sep 10;17(18):6585. doi: 10.3390/ijerph17186585.
Air pollution has attracted increasing attention in recent years. Cluster analysis, scene analysis, and the potential source contribution function (PSCF), based on the backward trajectory model, were used to identify the transport pathways and potential source regions of PM and PM (particulate matter with an aerodynamic diameter of not more than 2.5 µm and 10 µm) in Changchun in 2018. In addition, the PSCF was slightly improved. The highest average monthly concentrations of PM and PM appeared in March and April, when they reached 53.9μg/m and 120.0 μg/m, respectively. The main potential source regions of PM and PM were generally similar: western Jilin Province, northwestern Inner Mongolia, northeastern Liaoning Province, and the Yellow Sea region. The secondary potential source regions were southern Russia, central Mongolia, western Shandong Province, eastern Hebei Province, and eastern Jiangsu Province. The northwest and southwest directions were found to be the two pathways that mainly affect the air quality of Changchun City. Moreover, the northwestern pathway had a larger potential contribution source area than the southwestern pathway. The airflow in the southwest direction came from Liaoning Province, Shandong Province, and the Yellow Sea region. This mainly occurred in summer; its transmission distance was short; it had a relatively higher weight potential source contribution function (WPSCF) value; it can be regarded as a local source; and its representative pollutants were SO (sulfur dioxide), CO (carbon monoxide), and O (ozone). The northwestern pathway passed through Russia, Mongolia, and Inner Mongolia. The transmission distance of this pathway was longer; it had a relatively lower WPSCF value; it can be considered as a natural source to a certain extent; it mainly occurred in autumn and, especially, in winter; and the representative pollutants of this pathway were NO (nitric oxide), NOx (nitrogen oxide), PM, and PM.
近年来，空气污染受到了越来越多的关注。采用聚类分析、场分析和潜在源贡献函数（PSCF），基于后向轨迹模型，识别了 2018 年长春 PM 和 PM（空气动力学直径不超过 2.5 µm 和 10 µm 的颗粒物）的传输途径和潜在源区。此外，对 PSCF 进行了略微改进。PM 和 PM 的最高月平均浓度出现在 3 月和 4 月，分别达到 53.9μg/m 和 120.0μg/m。PM 和 PM 的主要潜在源区大致相同：吉林省西部、内蒙古西北部、辽宁省东北部和黄海地区。次潜在源区为俄罗斯南部、蒙古国中部、山东省西部和江苏省东部。发现西北和西南方向是影响长春市空气质量的两个主要途径。此外，西北途径的潜在贡献源区大于西南途径。西南方向的气流来自辽宁省、山东省和黄海地区。这种情况主要发生在夏季；传输距离短；具有相对较高的权重潜在源贡献函数（WPSCF）值；可视为本地源；其代表污染物为 SO（二氧化硫）、CO（一氧化碳）和 O（臭氧）。西北途径经过俄罗斯、蒙古和内蒙古。这条途径的传输距离较长；具有相对较低的 WPSCF 值；在一定程度上可以认为是自然源；主要发生在秋季，尤其是冬季；这条途径的代表污染物为 NO（氮氧化物）、NOx（氮氧化物）、PM 和 PM。
