Did anyone ever notice that it is the ozone hole (more properly described as a thinning of the layer) at the South pole in our (northern hemisphere) summer and then it gets thin at the North pole during our winters?
The most crucial element of producing ozone is sunshine. Think about what part of the world has little of this at certain times of the year that coincide in the detection of the thinning.
Quiet! You're ruining the conspiracy!