[Evaluation of Air Pollution Characteristics and Air Quality Improvement Effect in Beijing and Chengdu].

التفاصيل البيبلوغرافية
العنوان:	[Evaluation of Air Pollution Characteristics and Air Quality Improvement Effect in Beijing and Chengdu].
المؤلفون:	Dang Y; Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, School of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu 610225, China., Zhang XL; Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, School of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu 610225, China., Rao XQ; Environmental Meteorological Center of China Meteorological Administration, Beijing 100081, China., Kang P; Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, School of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu 610225, China., He JJ; Chinese Academy of Meteorological Sciences, Beijing 100081, China., Lu NS; Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, School of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu 610225, China., Hua M; Chengdu Meteorological Bureau, Chengdu 610072, China., Xiang WG; Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, School of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu 610225, China.
المصدر:	Huan jing ke xue= Huanjing kexue [Huan Jing Ke Xue] 2021 Aug 08; Vol. 42 (8), pp. 3622-3632.
نوع المنشور:	Journal Article
اللغة:	Chinese
بيانات الدورية:	Publisher: Ke xue zhu ban she Country of Publication: China NLM ID: 8405344 Publication Model: Print Cited Medium: Print ISSN: 0250-3301 (Print) Linking ISSN: 02503301 NLM ISO Abbreviation: Huan Jing Ke Xue Subsets: MEDLINE
أسماء مطبوعة:	Original Publication: Beijing : Ke xue zhu ban she,
مواضيع طبية MeSH:	Air Pollutants/analysis , Air Pollution/analysis, Beijing ; China ; Cities ; Environmental Monitoring ; Particulate Matter/analysis ; Quality Improvement ; Seasons
مستخلص:	In recent years, China's air quality has been improving, and the concentration of atmospheric particulate matter has decreased significantly. In this study, the pollution characteristics and trends of two typical representative cities (Beijing and Chengdu) were analyzed. The geographical locations, pollution emissions, and meteorological diffusion conditions of the two cities were compared, to evaluate the relative contribution of meteorological conditions and pollution reduction regulations in decreasing fine particulate matter (PM 2.5 ) concentrations. The results showed that the number of heavily polluted days and pollution episodes in Beijing and Chengdu decreased significantly from 2013 to 2018, and the concentration of SO 2 and PM 2.5 decreased substantially. Compared to 2013, SO 2 concentration in Beijing and Chengdu has decreased by 77.8% and 70.9%, whereas PM 2.5 concentration has decreased by 42.7% and 48.5%, respectively. The largest reduction appeared in winter, when PM 2.5 decreased at an annual rate of 13.5 μg ·m ^-3 for Beijing and 14.1 μg ·m ^-3 for Chengdu. During the study period, the wind speed in Chengdu was less than that in Beijing, temperature was approximately 3℃ higher, and static wind in winter was more frequent. A significantly lower mixed-layer height, atmospheric capacity index, and ventilation coefficient in Chengdu resulted in more unfavorable atmospheric diffusion conditions. The static and stable weather index and the environmental meteorological index (EMI) also showed that the atmospheric diffusion conditions were better in Beijing than in Chengdu. The EMI of the two cities showed a decreasing trend during the study period, and the decline in EMI in Chengdu was the most significant in 2018, indicating an evident improvement in meteorological conditions. In 2018, emission reductions are estimated to have contributed 33.5% and 24% to the decrease in PM 2.5 in Beijing and Chengdu, respectively, and meteorological conditions contributed 7.2% and 11.1% to the reduction in these two cities. In winter, emission reductions respectively contributed 31.7% and 32.5% to reduction in Beijing and Chengdu, while meteorological conditions made a larger contribution.
فهرسة مساهمة:	Keywords: Beijing; Chengdu; contribution to PM2.5 decrease; environmental meteorological index(EMI); pollution characteristics; stable weather index(SWI); trend of change
المشرفين على المادة:	0 (Air Pollutants) 0 (Particulate Matter)
تواريخ الأحداث:	Date Created: 20210726 Date Completed: 20210727 Latest Revision: 20210727
رمز التحديث:	20240628
DOI:	10.13227/j.hjkx.202012104
PMID:	34309249
قاعدة البيانات:	MEDLINE

الوصف
تدمد:	0250-3301
DOI:	10.13227/j.hjkx.202012104