2021 至 2022 年中国中部典型工业城市 PM2.5 化学成分的季节变化趋势和光消散效应

IF 4.2 2区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Atmospheric Environment Pub Date : 2024-11-07 DOI:10.1016/j.atmosenv.2024.120922

Changlin Zhan , Chong Wei , Ziguo Liu , Hongxia Liu , Xuefen Yang , Jingru Zheng , Shan Liu , Jihong Quan , Yong Zhang , Qiyuan Wang , Nan Li , Junji Cao

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引用次数: 0

摘要

本研究调查了中国黄石 PM2.5 的浓度、化学成分和来源。PM2.5 的日平均水平在 8.43 到 193.08 μg m-3 之间，年平均值为 54.13 μg m-3，超过了中国 35 μg m-3 的年二级标准。季节平均浓度在冬季达到峰值，夏季最低。有机碳（OC）和元素碳（EC）的年均值分别为 4.89 μg m-3 和 0.94 μg m-3。水溶性无机离子（WSIIs）占 PM2.5 的 52.17%，主要成分是 NO3-、SO42- 和 NH4+。NO3-/SO42- 的平均比值为 1.65，表明主要污染源已从燃煤过渡到汽车尾气排放。化学质量重建显示，NH4NO3、（NH4）2SO4 和有机物（OM）占 PM2.5 质量的 65.3%。光消光（bext）的季节变化凸显了次生无机盐对能见度的影响，年平均 bext 为 346.30 ± 246.98 Mm-1。空气质量集群和潜在来源地区分析表明，PM2.5 及其成分主要来自本地和附近地区。这些发现强调了当地污染控制措施的有效性、污染源的变化以及有针对性地控制排放以改善城市地区空气质量和能见度的必要性。

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Seasonal trends and light extinction effects of PM2.5 chemical composition from 2021 to 2022 in a typical industrial city of central China

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Seasonal trends and light extinction effects of PM2.5 chemical composition from 2021 to 2022 in a typical industrial city of central China

This study investigates the concentrations, chemical compositions, and sources of PM_2.5 in Huangshi, China. Daily average PM_2.5 levels ranged from 8.43 to 193.08 μg m⁻³, with an annual mean of 54.13 μg m⁻³, exceeding China's annual secondary standard of 35 μg m⁻³. Seasonal mean concentrations peaked in winter and were lowest in summer. Organic carbon (OC) and elemental carbon (EC) had annual means of 4.89 μg m⁻³ and 0.94 μg m⁻³, respectively. Water-soluble inorganic ions (WSIIs) accounted for 52.17% of PM_2.5, with NO₃⁻, SO₄²⁻, and NH₄⁺ being the major components. The NO₃⁻/SO₄²⁻ ratio averaged 1.65, indicating a transition from coal combustion to vehicle emissions as the primary pollution source. Chemical mass reconstruction revealed that NH₄NO₃, (NH₄)₂SO₄, and organic matter (OM) accounted for 65.3% of PM_2.5 mass. Seasonal variations in light extinction (b_ext) highlighted the impact of secondary inorganic salts on visibility, with an annual average b_ext of 346.30 ± 246.98 Mm⁻¹. Airmass clusters and potential source region analysis suggested PM_2.5 and its components were primarily originated from local and nearby regions. These findings underscore the effectiveness of local pollution control measures, changing pollution sources, and the necessity for targeted emission controls to improve air quality and visibility in urban areas.

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来源期刊

Atmospheric Environment 环境科学-环境科学

CiteScore

9.40

自引率

8.00%

发文量

458

审稿时长

53 days

期刊介绍： Atmospheric Environment has an open access mirror journal Atmospheric Environment: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. Atmospheric Environment is the international journal for scientists in different disciplines related to atmospheric composition and its impacts. The journal publishes scientific articles with atmospheric relevance of emissions and depositions of gaseous and particulate compounds, chemical processes and physical effects in the atmosphere, as well as impacts of the changing atmospheric composition on human health, air quality, climate change, and ecosystems.