| Previous studies have shown that PM2.5is closely related to human health, cityvisibility and climate change. However, more than80%of Chinese urban PM2.5can notmeet ‘ambient air quality standard’（GB3095-2012）, the pollution situation of PM2.5inChina is not optimistic.The region of Beibu Gulf is economy backward in China, the atmosphere isrelatively good, however, the regional industry planning is still mainly focus on traditionalprojects, such as iron and steel, petrochemical and energy, with high energyconsumption, high pollution, by which can we foresee the trend of large amounts ofatmospheric pollutant emissions in the further economic development, and bring aboutgreater impact to the local atmospheric environment. Therefore, it is necessary to carryout observation and study of the PM2.5stutus in Beibu Gulf region, as well as to graspthe main source contribution, which could provide the basic information to the nationaland local departments who are responsible for making policy in air pollution prevention.Although many studies of urban PM2.5source apportionment have been carried out,they are mainly in the region of seriously polluted and economically developed, such asthe region of Jing-Jin-Ji, Yangtze River Delta and Pearl River Delta, and the region ofBeibu Gulf has not even been touched. This research was including the work of PM2.5chemical composition observation, synchronously meteorological data collection,pollution characteristics and space variations in9cities during half a month in summer.On this basis, PMF model had been applied to quantitative analysis of the main pollutionsources in9cities in Beibu Gulf. Through the phisical and chemical observation in theseplaces, the main content of the research was including:（1） PM2.5spatial distributioncharacteristics;（2） PM2.5chemical pollution characteristics;（3） PM2.5sourceapportionment. The purpose of this study was to understand the pollution characteristicsand main sources of PM2.5in the region of Beibu Gulf, and to provide the basicinformaiton for policy making in atomospheric pollution prevention.The observation, analysis and chemical composition of PM2.5inthe region of BeibuGulf during summer illustrated: the total average concentration of PM2.5was38.4±17.7 μg m-3, the average concentration ranged from23.0μg m-3to61.3μg m-3among18sampling points, which were all lower than the Secondary Concentration Limitation(75μg m-3)of Chinese Air Quality Standards （GB3095-2012）. The average concentration ofOC and EC were repectively9.2±2.6μg m-3and1.9±1.1μg m-3, and their spatialdistributions were consistent with PM2.5. The average contribution of TCA reached56.8%of PM2.5, the concentration of total water-soluble ions of PM2.5in Beibu Gulf was11.7±9.8μg m-3, which ocupied27.3±11.8%of the mass concentration percentage ofPM2.5, and which showed that carbon areosol and water-soluble ions were importantcomponent of PM2.5in9cities in Beibu Gulf.PMF model had been applied to the source apportionment of PM2.5in Beibu Gulfduring summer, which also showed secondary aerosol was the main source of PM2.5inthe region of Beibu Gulf. Additionally, other important sources were also involving, suchas industry pollution, vehicle exhaust, biomass burning and construction or road dust. |
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