Abstract: The increase of surface UV-B due to stratospheric ozone depletion would provide more energy for lower troposphere,strengthen the atmospheric oxidizing capacity and reactivity,especially the rapid production of O₃,particles,acid substances and other secondary pollutants and the photodissociation of certain organic compounds,cause more frequent events of photochemical smog,acid deposition and regional pollution,and then change the air composition and quality.In China,the significant impacts would be in the city and regional air pollution,acid rain pollution and air quality of Qingzang Plateau.