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photobiology
photobiotic
photoblastic
photocall
photocatalysis
photocathode
photocell
photochemical
photochemical smog
photochemistry
photochemotherapy
photochromic
photocoagulation
photocomposition
photoconduction
photoconductivity
photocopier
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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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