Before the problem was realised there was many years of scrapped fridges put into landfill, over time the units will fail and the gas could escape into the atmosphere --- perhaps
regulations re scrapping such devices has not always been in place.
I can remember the fridge repair man regassing the fridge on a regular basis, I doubt that when that fridge was trashed it was not degassed in a controlled manner because the hole in the ozone layer had not been discovered or its cause identified
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