COMPONENTS CHARACTERISTICS AND SOURCE APPORTIONMENT OF PM<sub>2.5</sub> IN AUTUMN AND WINTER IN JINCHENG

GUO Qianjin

doi:10.13205/j.hjgc.202407017

Volume 42 Issue 7

Jul. 2024

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GUO Qianjin. COMPONENTS CHARACTERISTICS AND SOURCE APPORTIONMENT OF PM2.5 IN AUTUMN AND WINTER IN JINCHENG[J]. ENVIRONMENTAL ENGINEERING , 2024, 42(7): 153-161. doi: 10.13205/j.hjgc.202407017

Citation:

GUO Qianjin. COMPONENTS CHARACTERISTICS AND SOURCE APPORTIONMENT OF PM_2.5 IN AUTUMN AND WINTER IN JINCHENG[J]. ENVIRONMENTAL ENGINEERING , 2024, 42(7): 153-161. doi: 10.13205/j.hjgc.202407017

GUO Qianjin. COMPONENTS CHARACTERISTICS AND SOURCE APPORTIONMENT OF PM2.5 IN AUTUMN AND WINTER IN JINCHENG[J]. ENVIRONMENTAL ENGINEERING , 2024, 42(7): 153-161. doi: 10.13205/j.hjgc.202407017

Citation:

GUO Qianjin. COMPONENTS CHARACTERISTICS AND SOURCE APPORTIONMENT OF PM_2.5 IN AUTUMN AND WINTER IN JINCHENG[J]. ENVIRONMENTAL ENGINEERING , 2024, 42(7): 153-161. doi: 10.13205/j.hjgc.202407017

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COMPONENTS CHARACTERISTICS AND SOURCE APPORTIONMENT OF PM_2.5 IN AUTUMN AND WINTER IN JINCHENG

doi: 10.13205/j.hjgc.202407017

GUO Qianjin

Jincheng Ecological Environment Comprehensive Guarantee Center, Jincheng 048026, China

Received Date: 2023-06-12
Available Online: 2024-12-02

Abstract

Abstract

Jincheng is an important coal chemical industry base in China, and its industrial economic structure is dominated by heavy industry. In recent years, PM_2.5 pollution has become prominent in Jincheng. Atmospheric PM_2.5 samples were collected from three sites in Jincheng in the autumn and winter from 2018 to 2019. This study analyzed the component concentrations (ions, elements, and carbon) and secondary transformation characteristics under different conditions. Backward trajectory was used to investigate the impact of regional transport on ambient air, and a chemical mass balance model was used to analyze the source of PM_2.5. The results showed that: 1) the concentration of PM_2.5 in Jincheng was 86.1 μg/m³ during the sampling period. The PM_2.5 concentration in the polluted period (131.1 μg/m³) was 2.3 times higher than that in the clean period (58.2 μg/m³), which maybe related to the high humidity and static stability conditions. 2) secondary inorganic ions were the main component (83.4%) of water-soluble ions in PM_2.5 in Jincheng, which had a higher concentration in the polluted period (71.2 μg/m³) than clean period (24.6 μg/m³). The conversion of SO₂ to SO^2-₄ in autumn and winter in Jincheng was mainly dominated by heterogeneous reactions, while the formation of NO^-₃ was influenced by both oxidation and heterogeneous hydrolysis. Compared with the clean period, the concentrations of OC and EC in polluted days increased by 88.5% and 83.0%, respectively. The backward trajectory results showed that under the influence of adverse meteorological conditions, the short-distance air mass from the southeast of Jincheng in January aggravated the pollution process, which reflected the importance of regional joint prevention and control. The results of source apportionment showed that dust source (18.4%), secondary nitrates (16.5%), coal combustion (15.9%) source, and vehicle source (12.0%) were the main source of PM_2.5. Therefore, to further reduce the concentration of PM_2.5 in Jincheng, it is necessary to strengthen the control of vehicle and coal combustion in autumn and winter to reduce the emissions of the primary pollutants (SO₂ and NO₂).
- PM_2.5,
- component characteristics,
- source apportionment,
- vehicle pollution,
- coal combustion pollution

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References(35)

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