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English definition of “photochemical smog”

photochemical smog

noun [C or U]    
a fog caused by light from the sun shining on chemicals in the air produced by traffic and industry Clouds, dew, fog and steamEnvironmental issuesRubbish and wasteProtection and protectors
(Definition of photochemical smog noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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