中文摘要：

大气颗粒物中PM2．5（空气动力学直径≤2．5μm）是导致雾霾天气主要污染物成分，与呼吸系统疾病关系密切。本文解析了PM2．5与雾霾的成分及来源，概述了PM2．5对上、下呼吸道疾病发生的影响，探讨了PM2．5对呼吸道疾病的研究机制，有助于PM2．5的防护以及呼吸道炎性疾病的预防及治疗。

英文摘要：

In atmospheric particulates, PM2.5 （particulate matter ≤2.5μm in aerodynamic diameter） is the main pollutants of haze, and has a closely relationship with respiratory system diseases. This paper analyzed the composition and source of PM2.5 and fog haze,summarized the effects of PM2.5 on the upper and lower respiratory tract diseases, and discussed the mechanism of PM2.5 on respiratory diseases. They are helpful to the protection of PM2.5 and the prevention and treatment of respiratory tract inflammation diseases.