Chemical composition, sources and evolution of PM2.5 during wintertime in the city cluster of southern Sichuan, China

Zhang, Junke; Huang, Xiaojuan; Li, Jiaqi; Chen, Luyao; Zhao, Rui; Wang, Rui; Sun, Wei; Chen, Chunying; Su, Yunfei; Wang, Fangzheng; Huang, Yawen; Lin, Chaobiao

doi:10.1016/j.apr.2022.101635

Cited by 12 publications

(2 citation statements)

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“…Therefore, coal 660 combustion in Chengdu still deserves attention. The contribution of vehicular emissions increased by 12.0% compared to 2018 (13.6%) (Song et al, 2022), and was significantly higher than that of other medium-sized cities in the SCB (8.6%-11.7%) (Zhang et al, 2023). This is mainly caused by the rapidly increasing number of motor vehicles.…”

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confidence: 84%

Chemical composition, source and formation mechanism of urban PM_2.5 in Southwest China

Zhang

Chen

et al. 2023

Preprint

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Abstract. Despite significant improvements in air quality in recent years, the Sichuan Basin (SCB) is still facing frequent haze pollution in winter. In this study, the chemical components of PM2.5 in a typical pollution period at the beginning of 2023 in Chengdu, a megacity in the SCB, were characterized by bulk-chemical and single-particle analysis, and the PM2.5 sources and formation mechanism of pollution were analyzed. The average mass concentration of PM2.5 during the study period was 95.4±29.7 μg m-3. Organic matter (OM) was the most abundant component (35.3 %), followed by nitrate (22.0 %), sulfate (9.2 %) and ammonium (7.8 %). The aerosol particles were classified into five categories: mineral, OM, S-rich, soot and fly ash/metal particles, and most of them were in the state of internal mixing. The entire observation period could be divided into two non-pollution periods (NP-1 and NP-2) and two haze periods (Haze-1 and Haze-2). With the evolution of pollution, the bulk-chemical and single-particle analysis exhibited similar characteristics, suggesting that Haze-1 was mainly caused by pollutants related to fossil fuel combustion, especially mobile sources, while Haze-2 was triggered by the rapidly increasing secondary pollutants. The PM2.5 sources included dust (8.5 %), biomass burning (3.5 %), coal combustion (15.5 %), industrial processes (6.5 %), vehicular emissions (25.6 %) and secondary sources (40.5 %). Analysis of WRF-Chem model results showed that the average contributions of local sources and regional transmission to pollution in Chengdu were the same (50 % vs 50 %). In addition, the source composition and WRF-Chem simulation results in different periods confirmed our analysis of the formation mechanisms of the two haze events. This study confirms that, despite the significant reduction in pollution experienced by Chengdu in the past decade, further significant reductions in PM2.5 are still needed, with particular emphasis on vehicular emissions and secondary sources. High intensity local emissions or large amounts of regional transmission may cause serious haze events, and more effective policies for local emissions reduction or joint prevention and control of regional air pollution are necessary in the future.

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Chemical composition, source and formation mechanism of urban PM_2.5 in Southwest China

Zhang

Chen

et al. 2023

Preprint

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“…

Fine particulate matter (PM 2.5 ) refers to particulate matter with an aerodynamic equivalent diameter less than or equal to 2.5 μm in ambient air [1], which is mainly composed of carbonaceous components (sometimes called carbonaceous aerosols), watersoluble ions and chemical elements [2][3][4][5][6][7]. Carbonaceous aerosols are the main constituents of PM 2.5 , accounting for approximately 20%~50% of the mass concentration of PM 2.5 in urban atmosphere [8][9][10][11][12]. It is generally classified into organic carbon (OC) and elemental carbon (EC, sometimes called black carbon).

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Characteristics and Sources Analysis of Carbonaceous Aerosols in Urban and Rural Areas of Nanchong City

Hu,

Xia,

et al. 2023

Pol. J. Environ. Stud.

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Comparative source apportionment of PM2.5 for 2014/2019 at a plateau city: Implications for air quality improvement in high-altitude areas

Zhang,

Zhao,

Liu

et al. 2024

Atmospheric Pollution Research

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Chemical composition, sources and evolution of PM2.5 during wintertime in the city cluster of southern Sichuan, China

Cited by 12 publications

References 55 publications

Chemical composition, source and formation mechanism of urban PM_2.5 in Southwest China

Chemical composition, source and formation mechanism of urban PM_2.5 in Southwest China

Characteristics and Sources Analysis of Carbonaceous Aerosols in Urban and Rural Areas of Nanchong City

Comparative source apportionment of PM2.5 for 2014/2019 at a plateau city: Implications for air quality improvement in high-altitude areas

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Chemical composition, sources and evolution of PM2.5 during wintertime in the city cluster of southern Sichuan, China

Cited by 12 publications

References 55 publications

Chemical composition, source and formation mechanism of urban PM2.5 in Southwest China

Chemical composition, source and formation mechanism of urban PM2.5 in Southwest China

Characteristics and Sources Analysis of Carbonaceous Aerosols in Urban and Rural Areas of Nanchong City

Comparative source apportionment of PM2.5 for 2014/2019 at a plateau city: Implications for air quality improvement in high-altitude areas

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Chemical composition, source and formation mechanism of urban PM_2.5 in Southwest China

Chemical composition, source and formation mechanism of urban PM_2.5 in Southwest China