It turns out there's more to ozone destruction than just CFCs.
Scientists have some good news and some bad news for ozone watchers.
That's the good news. CFCs released at the ground diffuse upward through the lowest layer of the atmosphere, called the troposphere. The vertical air currents of tropospheric weather help push CFCs up to the next layer, the stratosphere. Once there, CFCs rise more slowly because stratospheric air has less vertical air movement. In fact, it can take a CFC molecule about 2 years after being released at the ground to make it to the stratosphere where the ozone is.