Man made climate change question ....

I am having a hard time following the hole in the ozone layer stuff.
I am trying to understand but things don't seem to add up for me.

For one, how do you make a hole in a gas?? Isn't that like Scooby-Do logic where the fog is so thick he cuts it with a butter knife??

Also, the hole is supposed to be over the north pole where there has never been any industry that I know of.

So first ozone is: "An unstable, poisonous allotrope of oxygen, O3, that is formed naturally in the ozone layer from atmospheric oxygen by electric discharge or exposure to ultraviolet radiation.".
It's made every day.

Something I do understand is that ozone is a diamagnetic molecule.
"Of or relating to a substance that generates a magnetic field in the direction opposite to an externally applied magnetic field and is therefore repelled by it."
So if that being true, wouldn't that mean that ozone molecules would be pushed apart in a strong magnetic field? Making it appear to be thinner there? Like at the north pole?

The stuff that eats up the ozone layer are bromine or chlorine.
" Bromine gas is heavier than air, so it would settle in low-lying areas."
"Chlorine gas is a chemical compound consisting of one chlorine atom and two atoms of oxygen. It's poisonous, colorless, flammable, and heavier than air-which means it will sink to low areas in your home or business before spreading out."
So if both are heavier than air, how are they getting 23,000 feet off the ground and into the ozone layer?

The more I look for answers the more I scratch my head.