Title: Pollution Characteristics and Source Apportionment of PM_(2.5) during Heavy Pollution Process in Urumchi City
Abstract: Recently heavy air pollution episodes have frequently happened in many cities of China,which attracts much social public attention. Limited researches on characteristics of PM 2. 5 and source apportionments during the heavy pollution process in China have been reported in publications. This study aimed to deeply understand characteristics of PM 2. 5 and source contributions during the heavy pollution process in typical cities of China. The ambient PM 2. 5 samples were collected in Urumchi City from 19th-30th,January,2013. Based on the Technical Regulation on Ambient Air Quality Index( on trial),heavy pollution episodes were identified based on data of mass concentrations from 19th-28th,January. The PM 2. 5 and main chemicals( e. g.,water solvent ions,inorganic elements and carbon species) were analyzed and presented by correlation analysis to identify the characteristics of PM 2. 5. The enrichment factor was used to assess contributions of crustal and anthropogenic sources. The source apportionment of PM 2. 5 was conducted via the CMB model. The results showed that the average mass concentration of PM 2. 5 was over than the National Air Quality Standard. The PM 2. 5 concentration was the highest at the site of Midong Environmental Protect Agency,followed by sites of Tielu Agency and Monitoring Station. SO 4 2-,TC,Si and NO 3-were the main chemical compositions and secondary ions accounted for 43. 1% in PM 2. 5. Resuspended dust,coal combustion dust and secondary particles were the main contents of the ambient PM 2. 5,with contributions of 24. 7%,15. 6% and 38. 0% in the urban area of Urumchi City and 20. 8%,28. 0% and 36. 2% in Midong District,respectively,while the corresponding contributions of secondary sulfate were 28. 6% and 27. 0%.
Publication Year: 2014
Publication Date: 2014-01-01
Language: en
Type: article
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Cited By Count: 4
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