CFC: ozone kill ratio at 1: 1O, OOO: No one foresaw that because CFCs entering the atmosphere would not easily break down due to their extremely stable nature, and would continue to rise right up into the ozone layer (the area about 20-30 kilometers above the surface of the earth), and that they could further remain there for decades or even centuries.
沒有人想到，逸入大氣中的氟氯碳化物，由於它的化學性質非常穩定，不易分解，因此可以一直上升到臭氧層（距離地面廿至卅公里之間的區域）中，並且可以在那裡停留數十年乃至於上百年。