Potential answers for "Part of the ozone layer that's shrinking"

⭐⭐⭐⭐ HOLE
⭐⭐⭐ FREON
⭐⭐⭐ UVRAY
⭐⭐⭐ CFCGASES
⭐⭐⭐ SHIELD
⭐⭐⭐ SHIELDER
⭐⭐⭐ CFC

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