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photocopier
photocopy
photocurrent
photodecomposition
photodegradable
photodermatology
photodiode
photodisintegration
photodriven
photoduplicate
photodynamic
photodynamics
photoelectric
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photochemical smog
pho·to·chem·i·cal smog


noun 
Definition:
 
sunlight-catalyzed air pollution: air pollution caused by the effect of strong sunlight on nitrogen dioxide and hydrocarbons emitted by motor vehicles, creating a harmful haze of minute droplets in the air
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