A Comparative Study on Air Pollution Characteristics in Four Key Cities during 2013 in Guangxi Province, China

Jing-Ying Mao, Zhi-Ming Chen, Zong-Kai Jiang, Zhao-Yu Mo, Hong-Jiao Li, Fan Meng, Bei Chen, Hui-Jiao Ling and Hong Li
Additional contact information
Jing-Ying Mao: Institute for Environmental and Climate Research, Jinan University, Guangzhou 510632, China
Zhi-Ming Chen: Scientific Research Academy of Guangxi Environmental Protection, Nanning 530022, China
Zong-Kai Jiang: College of Earth Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Zhao-Yu Mo: Scientific Research Academy of Guangxi Environmental Protection, Nanning 530022, China
Hong-Jiao Li: Scientific Research Academy of Guangxi Environmental Protection, Nanning 530022, China
Fan Meng: Chinese Research Academy of Environmental Sciences, Beijing 100012, China
Bei Chen: Guangxi Environmental Monitoring Centre, Nanning 530028, China
Hui-Jiao Ling: Scientific Research Academy of Guangxi Environmental Protection, Nanning 530022, China
Hong Li: Chinese Research Academy of Environmental Sciences, Beijing 100012, China

Sustainability, 2021, vol. 13, issue 4, 1-17

Abstract: 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. PM 2.5 was the dominant pollutant in each city, followed by O 3 , PM 10 , and NO 2 . Concentrations of SO 2 and CO did not exceed their National Ambient Air Quality Standard Grade II limit values. In the cities, the concentrations of PM 2.5 , PM 10 , NO 2 , and SO 2 were high during fall and winter and low during spring and summer, while the concentrations of O 3 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.

Keywords: air quality; pollution episodes; pollution sources; long-distance transportation; back trajectory (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
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