大连市区大气中PAHs来源、分布及随季节变化分析

Distribution and seasonal changing and source identification of polycyclic aromatic hydrocarbons in atmosphere of Dalian

多环芳烃PAHs是公认危害性最大的大气污染物,研究其在城市大气中的分布、季节变化及对其来源的识别判定可为PAHs污染防治提供科学依据.以大连市为例,分析了PAHs在市区大气中的分布,揭示了不同季节的浓度变化规律,对大气中的PAHs的来源进行了判别.结果表明,大连市区大气中的PAHs主要分布在交通繁华区和工业区;冬季浓度明显高于夏季;冬季污染主要来源于燃煤取暖,夏季为机动车尾气和燃煤的混合.

PAHs are regarded as the most hazardous pollutants in atmosphere. It is significant to analyze PAHs distribution in Dalian urban aerosol, study its seasonal changing, and identify its source. The results indicate that the concentration of PAHs in industrial area and traffic area is higher than that in other area. As season changing, the concentration of PAHs in winter is higher than that in summer. The PAHs come mainly from coal burning in winter. In summer, both coal burning and traffic exhaust contribute to PAHs.