中文摘要：

细颗粒物由于其粒径小，比表面积大，对人体的危害性大等特点而受到世界各地的广泛关注。该文总结了我国有关大气细颗粒物PM2．5的研究现状，主要围绕细颗粒物PM2．5的水平、成分、来源以及污染特征等进行了论述，并对其研究动向进行了展望。

英文摘要：

The ambient fine particles have attracted the concern of the peoples worldwide due to their smaller size, larger specific surface area, more adverse health effects and the other characteristics. This paper reviewed the current research status of the fine particulate matter （PM2.5） in China, including mass concentration, chemical composition,source and pollution characteristics, as well as the research trends in future.