a quote from “The Nonsense That is Ozone-Depletion”
by Ken Ring (2009) at http://www.ourcivilisation.com/ozone/king.htm
One Hole is Larger than the Other
Let’s look at one last factor, so often reported; that the Antarctic hole is larger than the Arctic one. One would think that even if inert heavier-than-air substances could make it up into space, that they would do it more around the densely populated regions of earth — the northern hemisphere; and affect the Arctic Hole more than the Antarctic. No one is disputing that the hole over the Antarctic is definitely much bigger. The Southern hemisphere has a longer winter than the Northern hemisphere because Earth is further from the sun in July than in January. Longer winter means bigger hole. But also maybe, some chlorine is coming from some other source, instead of CFCs. Let’s look around.
Aha! Just a few miles upwind from the Antarctic camp where all the readings about ozone-depletion originate from, is a rather large hill called Mt Erebus.