Yup. CFCs breakdown in sunlight and the lighter chemicals were floating upward.
I remember my dad talking about it when it happened. There wasn’t much of a fuss about it because the experimental evidence was so clear and replicable (unlike AGW).
Evidence is absolutely clear on this, this isn’t some debate.
They believed, (incorrectly) that CFC’s would not break down... however, evidence showed that they did indeed break down from sunlight in the upper atmosphere.
This isn’t some conspiracy theory, or fudged hockey stick data, this is proven and repeated and observed science, there is no debate that CFC’s caused OZONE depletion.
Anyone arguing otherwise is just wholesale ignorant.