位于地球外围20～25km处的臭氧层,对太阳辐射的紫外线具有屏蔽作用,从而保护地球上的人类和生物免受紫外线的伤害,故有“地球之盾”之称。但近年来,“地球之盾”却出现了残缺。 1985年英国科学家法曼等报道,1976年以来,每年10月在南极上空可观测到的臭氧层总浓度约降低40％。几乎同时,美国宇航局通过卫星监测,证实在南极上空确实存在一个很大的季节性“臭氧空洞”,其位置每年都在 The ozone layer located 20~25km away from the periphery of the earth has a shielding effect against the ultraviolet radiation of the sun, thus protecting humans and creatures on the earth from ultraviolet radiation, and is thus called “the shield of the earth.” However, in recent years, the “Shield of the Earth” has become incomplete. In 1985, the British scientist Farman et al. reported that since 1976, the total ozone concentration observed in the sky above Antarctica decreased by about 40% every October. Almost at the same time, NASA monitored through satellites and confirmed that there is indeed a large seasonal “ozone hole” over Antarctica. Its location is every year.