The carbon is to ensure that you dont let any free ozone into the tank. It is cheap insurance, and the tank could probably use the carbon anyway
If you smell ozone, run the skimmer discharge air through some carbon, too.
I enjoy the smell of ozone, but the more I read, it IS bad for you.
I have an ozone lamp in my HVAC system that I will turn on once in awhile. It helps clear the air. I usually run it on a timer when leaving the house. Restoration companies use ozone for clearing the smell from house fires, floods, etc. We have a large ozone generator on our trash compactor at work, and it works wonders.