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I couldn't find info on how long it takes surface ozone to reach the stratosphere, but I recall from grade school it might be many years. I also couldn't find how much surface ozone is produced vs how much is created in the stratosphere via UV.
The impression I got was that the vast majority of ozone is created in the stratosphere by UV. I would expect the rate of production to be fairly linear since oxygen concentration and UV radiation are relatively stable.
How much extra UV reaches the surface when there is an ozone "hole"? How harmful is it, and can I mitigate the effect by simply being more diligent about sunscreen use?
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