中文摘要：

二次有机气溶胶（SOA）的形成是当今大气化学过程的研究热点之一．城市大气中二次有机碳占颗粒物总有机碳的17％～65％．单萜烯和芳香族化合物分别是SOA最重要的天然和人为源前体物，在大气中与·OH，NO3^-和O3等氧化剂发生多途径反应形成有机酸、多官能团羰基化合物、硝基化合物等半挥发性有机物，通过吸附、吸收等过程进入颗粒相，改变了气溶胶的特性及其环境效应．有机化合物表现出较强的源特征性，可以作为示踪分子解析颗粒物来源，二元羧酸是SOA的潜在示踪物．论述了SOA研究的最新进展并指出了未来的研究方向．

英文摘要：

The formation of secondary organic aerosol （SOA） is one of the research focuses in atmospheric chemical process. In urban atmosphere, secondary organic carbon constitutes about 17%-65% of the total particulate organic carbon. Monoterpene and aromatics are the most important natural and anthropogenic precursors of SOA, respectively. The volatile precursors react with atmospheric oxidants such as hydroxyl （·OH）, nitrate radical （NO3^-） and O3 through multiple reaction pathways, producing semi-volatile secondary organics including diacids, multifunctional carbonyls and nitrate organics, etc. Theses compounds can distribute into particulate phase via adsorption and absorption processes, and will alter the property and environmental effects of ambient aerosols. Organic molecular markers are utilized to apportion the sources of atmospheric ambient aerosols, and organic diacids are potential tracers for SOA. In this article, the advances and problems in SOA research are reviewed, and future research recommendations are presented.