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ozone
mastery UK /ˈəʊzəʊn/ US /ˈoʊzoʊn/nounverb
card 1 of 2 · preposition
The city struggled with air pollution problems _____ ozone levels during the hot summer months.
card 1 of 2 · preposition
The city struggled with air pollution problems _____ ozone levels during the hot summer months.