Type of metal doesn’t matter, it’s any particle that leftover CFCs from the 1970s can stick to and make it more likely for them to react and destroy ozone. The ozone hole is over Antarctica and changes size seasonally because high altitude ice clouds do the same thing, smoke from forest fires also does it.
Even if you like the bot you should be downvoting it because that puts it in a predictable spot: at the bottom, without getting in the way of real comments.