[Analysis of PM2.5 and O3 Pollution Causes in Hangzhou Based on High-resolution Enhanced Observation During the Asian Games].

Q2 Environmental Science
Ren-Chang Yan, Yong Lai, Tian Zhang, Jia-Jia Jin, Xu Lin, Yun-Yun Wang, Qi-Fan Shuai, Luo-Lan Fei, Jian-Dong Shen, Xu-Hong Ye, Shu-Hui Zhu
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引用次数: 0

Abstract

Based on the high-resolution enhanced observation data of PM2.5 organic molecular tracers, aldehydes and ketone OVOC components, long-chain alkane IVOC components, and key species of atmospheric oxidation during September 1 to October 27, 2023, the causes of PM2.5 and O3 pollution in Hangzhou were analyzed. Seven pollution processes were selected with the average daily concentration of PM2.5 exceeding 35 μg·m-3 or the maximum 8-hour concentration of O3 exceeding 160 μg·m-3. Then, these pollution processes were divided into four types: north-northeast transmission type (T1), east-southeast transmission type (T2), north-northwest transmission type (T3), and statically stable type (T4) by airflow trajectory. The research results indicated that the T2 pollution process exhibited strong PM2.5 and O3 composite pollution characteristics and the photochemical oxidation reaction of active VOC components, such as long-chain alkanes and terpenes in the atmospheric environment was the major pollution cause of this type. In the process of T1 and T3 pollution, the overall reactivity of VOCs was low, resulting in relatively weak O3 generation. However, the causes of PM2.5 in these two types of pollution processes were different. T1 pollution was affected by low temperature and high humidity meteorological conditions and the enhanced liquid-phase oxidation process led to a significant increase in nitrate concentration. T3 pollution was significantly affected by emissions from coal combustion, biomass combustion, and other sources, with a relatively high proportion of primary components in PM2.5. The T4 pollution process was significantly affected by local primary anthropogenic emissions, thus the control of local catering source and mobile source emissions must be strengthened.

[基于亚运会期间高分辨率增强观测的杭州PM2.5和O3污染成因分析]。
基于2023年9月1日至10月27日PM2.5有机分子示踪剂、醛酮类OVOC组分、长链烷烃类IVOC组分、大气氧化关键组分的高分辨率增强观测数据,分析了杭州地区PM2.5和O3污染的原因。选取PM2.5日均浓度超过35 μg·m-3或O3最大8小时浓度超过160 μg·m-3的7个污染过程。然后根据气流轨迹将污染过程划分为东北偏北传播型(T1)、东南偏东传播型(T2)、西北偏北传播型(T3)和静稳型(T4) 4种类型。研究结果表明,T2污染过程表现出较强的PM2.5和O3复合污染特征,大气环境中长链烷烃、萜烯等活性VOC组分的光化学氧化反应是该类污染的主要原因。在T1和T3污染过程中,VOCs的总体反应性较低,导致O3生成相对较弱。但是,这两种污染过程中PM2.5产生的原因是不同的。T1污染受低温高湿气象条件影响,液相氧化过程增强导致硝酸盐浓度显著升高。T3污染受燃煤、生物质燃烧等源排放影响显著,PM2.5中一次组分占比较高。T4污染过程受当地一次人为排放影响显著,必须加强对当地餐饮源和移动源排放的控制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
环境科学
环境科学 Environmental Science-Environmental Science (all)
CiteScore
4.40
自引率
0.00%
发文量
15329
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