The full extent of the damage that CFCs have caused to the ozone layer is not known and will not be known for decades; however, marked decreases in column ozone have already been observed.
Kerusakan sepenuhnya yang disebabkan CFC terhadap lapisan ozon tidak diketahui dan tidak akan diketahui selama beberapa dekade; namun, penurunan kolom ozon yang ditandai telah diamati.