China’s economic rapid development also brings a series of environmental problems such as air pollution. Among them, the PM2.5 in air pollutants is easily inhaled by human body, which can induce asthma, acute bronchitis and other respiratory diseases, even lead to lung cancer. A large number of experimental studies have shown that a variety of functional components in tea have the effects of antioxidant, anti-inflammatory and anti-cancer. In this paper, the effect of PM2.5 in air on human respiratory system and the research progress of prevent...