As I understand it ozone needs sunlight to be created, UV is the driver, yet there are many reports that UV levels are down and and a cold winter is forecast. Also this being the NH winter there is NO sunlight at the north pole right now.
has some interesting information:
Ozone is a powerful oxidizing agent, far stronger than O2. It is also unstable at high concentrations, decaying to ordinary diatomic oxygen (with a half-life of about half an hour in atmospheric conditions):
Have a look at some data at the Dobson Sites
map. Click on a red dot.
I found the difference in annual ozone levels between Barrow and Mauna Loa quite surprising.