How much of CFCs minimum need for it to completely destroy ozone in 1 area within 1 year .And how big the container need to be.

Assume that there's a building/ building district that has gas tank that contain CFCs(Chlorofluorocarbon) use as coolant. And got stuck by missiles and gas leak / tank complete destroyed.(Ratio of all thing beside gas tank and the gas tank is 7:3) How much of CFCs minimum need…

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