photochemical smog
noun [ C or U ] uk/ˌfəʊ.təʊ.kem.ɪ.kəl ˈsmɒɡ/ us/ˌfoʊ.t̬oʊ.kem.ɪ.kəl ˈsmɑːɡ/
光化烟雾
a fog caused by light from the sun shining on chemicals in the air produced by traffic and industry
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