Ozone is a natural gas, which is produced when sunlight strikes the atmosphere.
O3, ozone, is poisonous, but it does filter out radiation. Ozone is absent from the North and South Poles because the sun never strikes those areas directly, but at such an oblique angle that it does not produce ozone. It's normal to have an ozone hole in these areas. Even convection currents would not carry man made R-12 to the ozone layer for 100 years, which is a longer time than man has been using it. Man has done almost nothing to the ozone.