The conclusions,by studying on the characteristics of theconcentrations of priority polycyclic aromatic hydrocarbons in dustfall and contrasting with aerosols in Macao,are as follows.①The concentrations of priority PAHs in dustfall were influenced by spatial locations and were diluted by soil from ground,and the highest concentrations were occurred at heavy traffic,commercial and crowded residents region.②The concentrations of priority PAHs in dustfall are lower than those in aerosol,and the ratios of the concentrations of priority PAHs in dustfall to those in aerosol are 0.02 to 0.08 at night and 0.03 to 0.12 in daytime,respectively.③There is a difference in the distrbution of individual priority PAHs in dustfall and in aerosol,scarce of 2-ring and 3-ring compounds of PAHs in aerosol and rich in 4-ring compounds of PAHs in dustfall.%通过对澳门大气降尘中的优控多环芳烃含量特征研究以及与气溶胶中的对比研究认为：①降尘中的优控多环芳烃含量受空间位置的影响，地面降尘由于受到土壤的稀释而使其中PAHs的含量降低，交通商业居民集中区降尘中的PAHs含量较高；②降尘中的PAHs含量较气溶胶中的低，与夜晚气溶胶中的含量比值为0.02～0.08，与白天气溶胶中的含量比值为0.03～0.12；③降尘中的优控多环芳烃的分布与气溶胶中的存在差异，气溶胶显示贫2个苯环和3个苯环PAHs的特征，降尘显示富4个苯环PAHs的特征。
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