珠三角大气挥发性有机物的国庆效应及其源解析

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Abstract The typical urban and suburban sites in the Pearl River Delta (PRD) were selected to analyse the concentration, source and O₃ formation potential of VOCs before, during and after the CNDH in 2021. The results showed that the overall O₃ concentration in the PRD decreased from pre-CNDH to after-CNDH. O₃ pollution was serious pre-CNDH and during CNDH, and the mean concentrations were (102.6±64.3), (80.2±47.7)µg/m³, respectively. In addition, the occurrence frequency of O₃ pollution and excessive O₃ concentration in urban areas were higher than those in suburban areas. The changes of TVOC and alkanes in the PRD were consistent, and alkanes could be the main components affecting the changes of TVOC. The concentrations of alkynes, highly active olefins and aromatic hydrocarbons in urban areas showed a pattern of decreasing during the holiday and increasing after the CNDH. The concentrations of alkynes increased the most after the holiday with a maximum increase of 82%. During the CNDH, the concentrations of VOCs from industrial sources such as toluene and xylene decreased significantly (about 30%), while the concentrations of VOCs from traffic sources such as n/iso-butane and n/iso-pentane increased (about 10%), showing a holiday effect of work and production shutdown plus travel peak during holidays. The source analysis based on the ratio of characteristic markers and positive matrix factorization (PMF) showed that the main contribution sources of VOCs in the PRD during holidays were vehicle emission sources (32.4%±5.3%). During non-holiday periods, in addition to vehicle emission sources (31.2%±10.8%) and solvent use sources (20.0%±7.9%), oil and gas evaporation sources (21.3%±3.8%) and combustion sources (23.9%±12.3%) should also be paid attention to in urban areas and suburban areas. The change of the largest contribution source between non-holidays and holidays reflected the different directions of population flow. The major contribution groups on holidays and non-holidays in urban areas were aromatic hydrocarbons, and those in suburban areas were olefins or aromatic hydrocarbons. The OFP ratios of olefins during holidays in urban and suburban areas were higher than those during non-holidays, while the ratios of aromatic hydrocarbons were the opposite.

Key words： volatile organic compounds (VOCs) Pearl River Delta National Day holiday effect PMF source analysis photochemical pollution

Received: 03 November 2022

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	CHEN Jun
	GONG Dao-cheng
	LIAO Tong
	ZHOU Yan
	ZHANG Tao
	WANG Rui-Wen
	WANG Hao
	CHEN Duo-hong
	WANG Bo-guang

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CHEN Jun,GONG Dao-cheng,LIAO Tong等. National Day effect and source analysis of atmospheric volatile organic compounds in the Pearl River Delta region[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(7): 3265-3280.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I7/3265

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