Definition of photochemical smog in English:

photochemical smog

Line breaks: photo|chem¦ical smog

Entry from British & World English dictionary

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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Word of the day anomalous
Pronunciation: əˈnɒm(ə)ləs
adjective
deviating from what is standard, normal, or expected