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Zheng D.,Peking University | Wang X.,Peking University | Zhou J.,Ningbo Environmental Monitoring Center | Ying H.,Ningbo Environmental Monitoring Center | And 2 more authors.
Huanjing Kexue Xuebao/Acta Scientiae Circumstantiae | Year: 2015

To investigate PM2.5 pollution characteristics and its major affecting factors, the Models-3/CMAQ modeling system was applied to simulate PM2.5 pollution in Ningbo in January, 2013. The results showed that high levels of PM2.5 occurred in the downtown, the north region and the east coastal region of Ningbo. Besides local emissions, aerosol formation and transport processes of PM2.5 were enhanced during the non-attainment days compared with the attainment days, especially horizontal transport process. The contribution of aerosol formation process was significant near the ground, and decreased gradually with the height. Nitrate accounted for ~70% of secondary fine particulate matter. Sulfate was mainly from the atmospheric transports and primary emissions of Ningbo, accounting for 40% and 44% of sulfate level, respectively. PM2.5 pollution of Ningbo was mainly influenced by the transport of northern coastal air mass (54%), northwestern continental air mass (21%) and western local air mass (25%). The highest PM2.5 concentration was primarily related to short-distance transport from the northwest. When East China suffered from fine particle pollution (haze) on a large scale, long-distance transport from the northwest and the north would also lead to PM2.5 pollution in Ningbo. ©, 2015, Science Press. All right reserved.

Li X.,Peking University | Wang X.-S.,Peking University | Liu Z.,Ningbo Environmental Protection Scientific Research and Design Institute | Wu L.,Ningbo Environmental Protection Bureau | Hu J.,Ningbo Environmental Protection Bureau
Huanjing Kexue/Environmental Science | Year: 2014

Ningbo is an important industrial city in eastern China and is also the economic center in the south wing of the Yangtze River Delta (YRD). Recently, the VOC emissions from the local industrial activities and its effects on both the regional air quality and people's health were getting more and more attention. The anthropogenic VOC emission inventory of Ningbo in 2010 was established with collecting comprehensive activity data of anthropogenic sources. Furthermore, the industrial sectors were studied and the significant industries were identified with their contribution quantified. The result shows that the amount of anthropogenic VOC emission in Ningbo in 2010 is 176 kt. Industry, transportation and residential source are the most important VOC anthropogenic sources in Ningbo, which accounted for 62.0%, 17.2% and 15.5% respectively. Synthetic materials manufacturing and refined petroleum products manufacturing are the most important VOC emitting industries, which contributed 18.6% and 13.1% of the total VOC amount respectively, signifying the influence of these two industries to the VOC emissions in Ningbo.

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