Potential answers for "Ozone or hydrogen"

⭐⭐⭐⭐ GAS
⭐⭐ ELEMENT
⭐⭐ SMOG
⭐⭐ CFCS
⭐⭐ FREON
⭐⭐ CFC
⭐⭐ ATWT
⭐⭐ SYMBOL

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