中文摘要：

对厦门市冬季不同功能区大气PM2.5中多环芳烃（PAHs）的昼夜变化特征进行分析，结果表明，在检出的13种PAHs中，总浓度及其组分均呈现明显的差异，PAHs总浓度（∑PAHs）分布在3．04-12．49ng·^-3；各功能区PAHs以菲、芘和含量相对较高，其中菲占优势，说明厦门市冬季大气PM，。中PAH。以[艹屈]菲的污染为主，局部地区晚间∑PAHs的浓度明显高于日间浓度，这可能与夜间大气混合层下降、污染物不易扩散传输、日间PAHs易光降解等有关。

英文摘要：

21 and 6 hours PMz5 samples were collected and analyzed for 16 priority polycyclic aromatic hydrocarbons （PAHs） from 5 different function zones in Xiamen in December 2004 to characterize their diurnal change. There were significant difference in the values of EPAHs （defined as the sum of 13 PAH compounds） among the five sampling sites. Three PAH compounds, phenanthrene, pyrene and chrysene, were the dominant pollutants. EPAHs in the day were much lower than those at the night at the following three sites, Huli, International Bank and Hongwen. These indicated that the relative mixed atmosphere and strong photolysis in the day can significantly influence the concentrations of PAHs in the PM2.5 in Xiamen.