Evolution of urban air pollution and typical pollution processes in the Fenwei Plain-Taking Baoji City as an example
SHI Ying-qiang1,2, QU Yao1,3, SHI Ju-lian1,2, LIU Sui-xin1, WANG Lu-yao1,2, WANG Nan1,2, ZHOU Yue1, ZHANG Ting1, SU Hui1,2, ZHU Chong-shu1,3, CAO Jun-ji1,4
1. Key Laboratory of Aerosol Chemistry and Physics, State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China; 2. Xi'an Institute for Innovative Earth Environment Research, Xi'an 710061, China; 3. National Observation and Research Station of Regional Ecological Environment Change and Comprehensive Management in the Guanzhong Plain, Shaanxi, Xi'an 710499, China; 4. Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
Abstract：The evolution of urban air pollution and typical pollution characteristics during the past five years (2017~2021) in the western Fenwei Plain (Baoji City) were investigated. The air quality has been improved significantly from 2017 to 2021 in Baoji City. The concentrations of PM2.5, CO-95 per (the 95th percentile of the daily concentrations of CO) and SO2 decreased by 24%, 47% and 36%, respectively, which indicated that the control of coal combustion was effective in Baoji City. The inter-annual variations of O3-8h-90 per (the 90th percentile of the daily concentrations of O3-8h) were comparable. The pollution of O3 should be given more consideration. The correlations between PM2.5 and Ox showed higher significance in summer than that in winter. High O3 concentrations can contribute to the enhancement of atmospheric oxidation and thus promote the formation of secondary aerosol in summer. The serious PM2.5 pollution were attributed to the low temperature, high humidity and low wind speed in winter, while those for O3 pollution were high temperature and low humidity in summer. Two typical pollution events were discussed with PM2.5 (pollution 1) and PM10 (pollution 2) as primary pollutant, respectively. The concentrations of EC (element carbon) and SNA (SO42-, NO3- and NH4+) increased significantly in pollution 1, which was attributed to the enhanced local emissions and secondary components. Due to the transport of dust, the concentrations of Al, Si, Ca, Fe and other crustal elements increased significantly in pollution 2. The largest contributors to PM2.5 were SNA (52%) and dust (65%) in the two pollution processes, respectively.
时迎强, 屈垚, 师菊莲, 刘随心, 王璐瑶, 王楠, 周岳, 张婷, 苏慧, 朱崇抒, 曹军骥. 汾渭平原城市大气污染演变及典型污染过程——以宝鸡市为例[J]. 中国环境科学, 2023, 43(S1): 1-9.
SHI Ying-qiang, QU Yao, SHI Ju-lian, LIU Sui-xin, WANG Lu-yao, WANG Nan, ZHOU Yue, ZHANG Ting, SU Hui, ZHU Chong-shu, CAO Jun-ji. Evolution of urban air pollution and typical pollution processes in the Fenwei Plain-Taking Baoji City as an example. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(S1): 1-9.
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