A Case Study of PM2.5 Characterization in Bangi, Selangor, Malaysia during the Southwest Monsoon Season
A Case Study of PM2.5 Characterization in Bangi, Selangor, Malaysia during the Southwest Monsoon Season
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DOI：
10.4209/aaqr.2015.04.0277
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发表时间：
2016-11-01
影响因子：
4
通讯作者：
Mizohata, Akira
中科院分区：
文献类型：
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作者：
Fujii, Yusuke;Mahmud, Mastura;Mizohata, Akira
2013年9月在马来西亚雪兰莪州的邦吉进行了一项基于地面采样的案例研究，以表征西南季风季节的环境PM2. 5。我们确定了PM2.5样品中的总质量浓度，有机碳，元素碳（EC）和金属。PM2.5的平均质量浓度为44.5 μ g m（-3），超过了美国环境保护局规定的24小时PM2.5为35 μ g m（-3）的国家空气质量标准。与其他东南亚国家相比，本研究的OC和EC浓度相对较高，这表明存在重要的OC和EC来源。碳EC/煤烟EC比的结果强烈表明，生物质燃烧是环境EC浓度的主要贡献者相比，燃煤和机动车排放。根据质量闭合模型的计算，有机物是PM2.5质量中最丰富的成分，为22.4 +/- 6.65 μ g m（-3），其次是硫酸盐，为4.84 +/- 2.49 rho g m（-3），EC为4.11 +/- 0.916 μ g m（-3）。这一结果表明，针对碳质PM2.5的来源是改善该研究领域空气质量的关键一步。
A case study was carried out to characterize the ambient PM2.5 based on ground-based sampling in Bangi, Selangor, Malaysia in September, 2013 during the southwest monsoon season. We determined the total mass concentration, organic carbon, elemental carbon (EC), and metals in PM2.5 samples. The mean PM2.5 mass concentration was 44.5 mu g m(-3), showing that it exceeded the national air quality standard of 35 mu g m(-3) for 24-hour PM2.5 by the U.S. Environmental Protection Agency. Relatively high OC and EC concentrations of this study compared to those of other Southeast Asian countries were observed, which indicate that significant sources of OC and EC exist. The results of char-EC/soot-EC ratios strongly suggest that biomass burning is the main contributor to ambient EC concentrations compared to coal combustion and motor vehicle emissions. From calculations using the mass closure model, organic matter was the most abundant component in PM2.5 mass at 22.4 +/- 6.65 mu g m(-3), followed by nss-sulfate at 4.84 +/- 2.49 rho g m(-3), and EC at 4.11 +/- 0.916 mu g m(-3). This result indicates that targeting the sources of carbonaceous PM2.5 is a crucial step to improve the air quality in this study field.