摘要
Ozone is one of the trace gases in atmosphere. Although it is very small in amount,it is of great importance to human being and biosphere because it absorbs effectively and cuts down the intensity of the solar ultraviolet radiation.In recent years, what the public are concerned of is the perturbation in the amount of O3 in the atmosphere resulted from human activities. The variation of ozone in atmosphere would affect photochemical reactions to a great extent. In addition, ozone acts as a thermal source in stratosphere. Con-
