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Based on ambient air quality data of the four key cities (Nanning, Liuzhou, Guilin, and Beihai) in Guangxi, China, along with an analysis of the main emission sources, topographic features, weather conditions, and backward trajectories, the variation of main air pollutants and pollution episodes in the four cities were studied. Results showed that air pollution was most serious in Liuzhou and Guilin, followed by Nanning and Beihai. PM2.5 was the dominant pollutant in each city, followed by O3, PM10, and NO2. Concentrations of SO2 and CO did not exceed their National Ambient Air Quality Standard Grade II limit values. In the cities, the concentrations of PM2.5, PM10, NO2, and SO2 were high during fall and winter and low during spring and summer, while the concentrations of O3 were high during fall and low during the other seasons. Concentrations of CO were low during summer and high during the other seasons in Nanning and Liuzhou, while they were high during spring and winter and low during summer and fall in Guilin and Beihai. In these cities, pollution episodes resulted mainly from stagnant accumulation and showed characteristics of regional pollution. However, pollution levels and durations for each city were different due to differences in main pollution sources, local geography, and weather conditions. The influences of air masses on the four cities were similar. They were mainly influenced by local emission sources in the spring, while during autumn, long-distance transportation from Hunan and Hubei was significant. In winter, air pollution in Nanning and Beihai was mostly affected by local emission sources, and that in Liuzhou and Guilin was mainly affected by long-distance transportation from the south and northeast of Guangxi.
Jing-Ying Mao; Zhi-Ming Chen; Zong-Kai Jiang; Zhao-Yu Mo; Hong-Jiao Li; Fan Meng; Bei Chen; Hui-Jiao Ling; Hong Li. A Comparative Study on Air Pollution Characteristics in Four Key Cities during 2013 in Guangxi Province, China. Sustainability 2021, 13, 1612 .
AMA StyleJing-Ying Mao, Zhi-Ming Chen, Zong-Kai Jiang, Zhao-Yu Mo, Hong-Jiao Li, Fan Meng, Bei Chen, Hui-Jiao Ling, Hong Li. A Comparative Study on Air Pollution Characteristics in Four Key Cities during 2013 in Guangxi Province, China. Sustainability. 2021; 13 (4):1612.
Chicago/Turabian StyleJing-Ying Mao; Zhi-Ming Chen; Zong-Kai Jiang; Zhao-Yu Mo; Hong-Jiao Li; Fan Meng; Bei Chen; Hui-Jiao Ling; Hong Li. 2021. "A Comparative Study on Air Pollution Characteristics in Four Key Cities during 2013 in Guangxi Province, China." Sustainability 13, no. 4: 1612.
The varying concentrations of polycyclic aromatic hydrocarbons (PAHs) at remote islands is an important indicator, demonstrating the contributions from different regional combustion sources. In this study, gaseous and particulate PAHs were measured at Weizhou Island in the Gulf of Tonkin from 15th March to 14th April, 2015. The concentrations of PAHs ranged from 116.22 to 186.74 ng/m3 and from 40.19 to 61.86 ng/m3 in gas and particulate phase, respectively, which were much higher than those of some remote sites in Asia. Phenanthrene, fluoranthene, pyrene, and chrysene, which were mainly found in diesel vehicle emissions, had relatively high concentrations in both gas and particulate phases. According to the comprehensive results of back trajectory cluster analysis and diagnostic ratios, the local vessel emission was probably the main source of PAHs, which was much more important than the coal and biomass combustion sources from remoter regions. The toxicities represented by ∑PAH7, benzo(a)pyrene-equivalent carcinogenic power, and 2,3,7,8-tetrachlorodibenzo-p-dioxin-based total toxicity potency are much higher in particulate phase than those in gas phase. However, the toxicities of gas phase should not be neglected from the point of view of indirect-acting mutagenicities due to the high contribution of fluoranthene.
Xiaoyang Yang; Shijie Liu; Yuanguan Gao; Wenjuan Zhao; Yu Liu; Jingying Mao; Zhaoyu Mo. Levels, Sources and Toxicity Risks of Polycyclic Aromatic Hydrocarbons at an Island Site in the Gulf of Tonkin. International Journal of Environmental Research and Public Health 2020, 17, 1338 .
AMA StyleXiaoyang Yang, Shijie Liu, Yuanguan Gao, Wenjuan Zhao, Yu Liu, Jingying Mao, Zhaoyu Mo. Levels, Sources and Toxicity Risks of Polycyclic Aromatic Hydrocarbons at an Island Site in the Gulf of Tonkin. International Journal of Environmental Research and Public Health. 2020; 17 (4):1338.
Chicago/Turabian StyleXiaoyang Yang; Shijie Liu; Yuanguan Gao; Wenjuan Zhao; Yu Liu; Jingying Mao; Zhaoyu Mo. 2020. "Levels, Sources and Toxicity Risks of Polycyclic Aromatic Hydrocarbons at an Island Site in the Gulf of Tonkin." International Journal of Environmental Research and Public Health 17, no. 4: 1338.