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Characteristics of PM 2.5 Chemical Species in 23 Chinese Cities Identified Using a Vehicular Platform

Author

Listed:
  • Hui Chen

    (Key Laboratory of Organic Compound Pollution Control Engineering, School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China)

  • Jingjing Liu

    (Key Laboratory of Organic Compound Pollution Control Engineering, School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China)

  • Peizhi Wang

    (Key Laboratory of Organic Compound Pollution Control Engineering, School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China)

  • Xiao Lin

    (Key Laboratory of Organic Compound Pollution Control Engineering, School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China)

  • Jingjin Ma

    (Ecological Environment Internet of Things and Big Data Application Technology National Engineering Research Center, Shijiazhuang 050035, China
    Hebei Advanced Environmental Protection Industry Innovation Center Co., Ltd., Shijiazhuang 050035, China)

  • Chunying Wang

    (Ecological Environment Internet of Things and Big Data Application Technology National Engineering Research Center, Shijiazhuang 050035, China
    Hebei Advanced Environmental Protection Industry Innovation Center Co., Ltd., Shijiazhuang 050035, China)

Abstract

PM 2.5 pollution remains a significant concern in China due to its adverse environmental and health implications. This study aims to explore in depth the differences in the causes of PM 2.5 pollution between some regions in China based on high temporal resolution PM 2.5 component information. We used a particulate matter chemical composition vehicle (PMCCV) as a mobile monitoring platform which travelled among 23 cities in China from March 2018 to December 2019 to collect PM 2.5 concentrations and chemical composition data. Observations revealed that PM 2.5 concentrations were notably higher in northern cities compared than their southern counterparts. Seasonal variation was evident, with peak concentrations during winter and troughs during summer. In regions experiencing severe winter pollution, such as Hebei and Shanxi (HB/SX), organic matter (OM) emerged as the dominant contributor (47.3%), escalating with increasing PM 2.5 concentrations. OM significantly impacted PM 2.5 levels during autumn in Jiangxi and Anhui (AH/JX) and across the monitoring period in Liuzhou, Guangxi (GX), with the former related to vehicle emissions and the latter related to bagasse reuse and biomass burning emissions. Conversely, nitrate (NO 3 − ) made the highest contribution to PM 2.5 during winter in the AH/JX region (34.4%), which was attributed to reduced SO 2 levels and favorable low-temperature conditions conducive to nitrate condensation. Notably, nitrate contribution to HB/SX rose notably in heavily polluted winter conditions and during light–moderate pollution episodes in the autumn. Sulfate (SO 4 2− ) was dominant among PM 2.5 components during summer in the study regions (29.9% in HB/SX, 36.1% in HN/SD, and 49.7% in AH/JX). Additionally, pollution incidents in Chuzhou, Anhui Province, and Baoding, Hebei Province, underscored nitrates and organic matter, respectively, as the primary causes of sharp PM 2.5 increases. These incidents highlighted the influence of large emissions of primary aerosols, gaseous precursors, and stagnant meteorological conditions as pivotal factors driving haze pollution in the HB/SX region.

Suggested Citation

  • Hui Chen & Jingjing Liu & Peizhi Wang & Xiao Lin & Jingjin Ma & Chunying Wang, 2024. "Characteristics of PM 2.5 Chemical Species in 23 Chinese Cities Identified Using a Vehicular Platform," Sustainability, MDPI, vol. 16(6), pages 1-16, March.
    • Handle: RePEc:gam:jsusta:v:16:y:2024:i:6:p:2340-:d:1355496
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    References listed on IDEAS

    as
    1. Jiannan Wu & Pan Zhang & Hongtao Yi & Zhao Qin, 2016. "What Causes Haze Pollution? An Empirical Study of PM 2.5 Concentrations in Chinese Cities," Sustainability, MDPI, vol. 8(2), pages 1-14, January.
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    3. Jie Yang & Xinran Fu & Liping Qiao & Lan Yao & Fei Zhang & Weiyue Li, 2023. "Characteristics of Atmospheric Pollution in a Chinese Megacity: Insights from Three Different Functional Areas," Sustainability, MDPI, vol. 15(3), pages 1-14, January.
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