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photochemical smog Line breaks: photo|chem¦ical smog

Entry from British & World English dictionary

Definition of photochemical smog in English:

noun

[mass noun]
Haze in the atmosphere accompanied by high levels of ozone and nitrogen oxides, caused by the action of sunlight on pollutants.

Definition of photochemical smog in:

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Pronunciation: ləks
adjective
expensive and of high quality; luxurious