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美国国家宇航局(NASA)的科学家说:1991年10月6日,南极上空的臭氧浓度降至有探测以来的最低值。从NASA的Nimbus 7号卫星上安装的臭氧总量测绘分光仪传送来的初步数据表明,南极臭氧空洞里的臭氧浓度为110士6道布森单位
Scientists at NASA said: On October 6, 1991, the ozone concentration over the Antarctic dropped to its lowest level since the probe was made. Preliminary data transmitted from the Total Ozone Mapping Spectrometer installed on NASA’s Nimbus 7 satellite indicate that ozone concentrations in the Antarctic ozone hole are 110 ± 6 Boussines units