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Tytuł:
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[Characteristics and Cause Analysis of Heavy Air Pollution in a Mountainous City During Winter].
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Autorzy:
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Liu ZC; Key Laboratory of Resources and Environmental System Optimization, Ministry of Education, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China.
Niu YY; Key Laboratory of Resources and Environmental System Optimization, Ministry of Education, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China.
Wu J; Key Laboratory of Resources and Environmental System Optimization, Ministry of Education, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China.
Yan YL; Key Laboratory of Resources and Environmental System Optimization, Ministry of Education, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China.
Hu DM; Key Laboratory of Resources and Environmental System Optimization, Ministry of Education, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China.
Qiu XH; Key Laboratory of Resources and Environmental System Optimization, Ministry of Education, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China.
Peng L; Key Laboratory of Resources and Environmental System Optimization, Ministry of Education, College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China.
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Źródło:
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Huan jing ke xue= Huanjing kexue [Huan Jing Ke Xue] 2021 Mar 08; Vol. 42 (3), pp. 1306-1314.
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Typ publikacji:
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English Abstract; Journal Article
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Język:
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Chinese
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Imprint Name(s):
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Original Publication: Beijing : Ke xue zhu ban she,
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Contributed Indexing:
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Keywords: PM2.5; carbonaceous components; cause of heavy air pollution; mountainous city; source apportionment; water-soluble ions
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Entry Date(s):
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Date Created: 20210320 Date Completed: 20210324 Latest Revision: 20210324
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Update Code:
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20240105
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DOI:
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10.13227/j.hjkx.202009138
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PMID:
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33742927
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Taking the typical heavy air pollution process in Yangquan from December 26, 2018 to January 20, 2019 as an example, the characteristics and cause analysis of heavy air pollution in a mountainous city in winter were analyzed in this study. The results showed that fine particle mass (PM 2.5 ) was the primary pollutant during the heavy pollution period. The water-soluble ions and carbonaceous components were the main components of PM 2.5 . The secondary ions of SO 4 2- , NO 3 - , and NH 4 + had the lager contribution to water-soluble ions (87.7%), and the secondary organic carbon (SOC) was the main component of the carbonaceous components (71.6%). The concentration of the secondary ions during the heavy pollution period increased by 5.3 times compared to levels before the heavy pollution period, and was an important component resulting in the fast increase of PM 2.5 . An analysis of meteorological conditions showed that PM 2.5 and its main components had a significantly positive relationship with humidity and a significantly negative relationship with wind speed. And that pollution became stronger with an increase in humidity and a decrease in wind speed. The typical meteorological characteristics of mountainous cities are high relative humidity and large temperature variations, which can accelerate the formation of secondary pollutants and are the main reasons for the rapid aggravation of PM 2.5 . In addition, the lower average wind speed caused by the relatively closed terrain in mountainous cities makes the diffusion conditions of air pollutants relatively poor, which is one of the reasons for the accumulation of pollutants. The source apportionment results showed that the secondary sources (46.0%) were the most important source of PM 2.5 , followed by coal combustion (32.6%), vehicle exhaust (19.8%), and fugitive dust (1.6%). Therefore, mountainous cities should pay more attention to controlling secondary components, especially secondary ions.
