photochemical smognoun [ C or U ]uk /ˌfəʊ.təʊ.kem.ɪ.kəl ˈsmɒɡ/ us /ˌfoʊ.t̬oʊ.kem.ɪ.kəl ˈsmɑːɡ/
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(Definition of “photochemical smog” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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