Comparison of NMHC measurements between 2010 and 2020 in Wuxi City, Yangtze River Delta region: Levels, compositions, sources, and impacts

IF 3.9 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Atmospheric Pollution Research Pub Date : 2024-07-17 DOI:10.1016/j.apr.2024.102260

Chen Wang , Yingyu Liu , Baolin Wang , Zhenguo Liu , Yuchun Sun , Na Yang , Lei Sun , Chuanyong Zhu , Guihuan Yan , Chongqing Xu , Sihua Lu , Min Shao

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引用次数: 0

Abstract

Field observation analyses of volatile organic compounds (VOCs) have gained significant attention due to their potential explaining atmospheric temporal trends. This study measured non-methane hydrocarbons (NMHCs) in Wuxi City, located in the Yangtze River Delta (YRD) of China, in 2010 and 2020. The aim was to gain a better understanding of the ten-year change of VOCs in terms of their mixing ratios, sources, role in ozone, secondary organic aerosol (SOA) formation, and health risks. The average NMHC level 2020 was 20.67 ppbv, which indicated a 20% drop from 2010. A notable shift was observed in the chemical composition of NMHCs. The contribution of alkanes increased from 45% to 62% in 2020, while that of the aromatics decreased from 25% in 2010 to 21% in 2020. Ratio analysis and receptor modelling for 2010 and 2020 were used to identify the source changes of VOC species. The source apportionment model showed that the contribution of vehicle exhaust decreased from 34.5% to 20.9% from 2010 to 2020, and that of the solvent increased from 15.1% to 25.3%. The chemical reactivity results suggested that aromatics played significant roles in photochemical reactions in Wuxi City. The ozone formation potential (OFP) and SOA potential of VOCs also showed decreasing trends from 2010 to 2020. The total OFP of alkenes decreased by 34.0%, from 30.6 to 20.2 ppbvO₃/ppbv. The total non-carcinogenic risk value for the key VOC species was 0.034 in 2010 and 0.024 in 2020. Although the carcinogenic risks for benzene have decreased significantly, the value is still above the acceptable carcinogenic risk level. The results of this study demonstrate the effectiveness of air pollution control measures in Wuxi City and highlight the positive impacts on reducing secondary pollution and health risks in this region over one decade.

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长江三角洲地区无锡市 2010 年和 2020 年非甲烷总烃测量结果的比较：水平、组成、来源和影响

挥发性有机化合物（VOCs）的实地观测分析因其可解释大气的时间趋势而备受关注。本研究测量了 2010 年和 2020 年中国长江三角洲（YRD）无锡市的非甲烷碳氢化合物（NMHCs）。目的是从混合比、来源、在臭氧和二次有机气溶胶（SOA）形成中的作用以及健康风险等方面更好地了解挥发性有机化合物的十年变化。2020 年的非甲烷总烃平均水平为 20.67 ppbv，与 2010 年相比下降了 20%。非甲烷总烃的化学成分发生了显著变化。烷烃的比例从 45% 上升到 2020 年的 62%，而芳烃的比例则从 2010 年的 25% 下降到 2020 年的 21%。利用 2010 年和 2020 年的比率分析和受体模型来确定挥发性有机化合物物种的来源变化。源分配模型显示，从 2010 年到 2020 年，汽车尾气的贡献率从 34.5%下降到 20.9%，而溶剂的贡献率从 15.1%上升到 25.3%。化学反应性结果表明，芳烃在无锡市的光化学反应中发挥了重要作用。从 2010 年到 2020 年，挥发性有机化合物的臭氧形成潜能值（OFP）和 SOA 潜能值也呈下降趋势。烯烃的总臭氧形成潜能值从 30.6 ppbvO3/ppbv 下降到 20.2 ppbvO3/ppbv，下降了 34.0%。主要挥发性有机化合物的非致癌总风险值在 2010 年为 0.034，2020 年为 0.024。虽然苯的致癌风险大幅下降，但其值仍高于可接受的致癌风险水平。本研究结果表明了无锡市大气污染控制措施的有效性，并强调了十年来该地区减少二次污染和健康风险的积极影响。

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来源期刊

Atmospheric Pollution Research ENVIRONMENTAL SCIENCES-

CiteScore

8.30

自引率

6.70%

发文量

256

审稿时长

36 days

期刊介绍： Atmospheric Pollution Research (APR) is an international journal designed for the publication of articles on air pollution. Papers should present novel experimental results, theory and modeling of air pollution on local, regional, or global scales. Areas covered are research on inorganic, organic, and persistent organic air pollutants, air quality monitoring, air quality management, atmospheric dispersion and transport, air-surface (soil, water, and vegetation) exchange of pollutants, dry and wet deposition, indoor air quality, exposure assessment, health effects, satellite measurements, natural emissions, atmospheric chemistry, greenhouse gases, and effects on climate change.