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                                    Which of the following are likely to be present in photo chemical smog? | 
                            
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Answer»  Answer: Photochemical smog is a mixture of pollutants that are formed when nitrogen oxides and volatile ORGANIC compounds (VOCS) REACT to sunlight, creating a brown haze above cities. It tends to occur more often in summer, because that is when we have the most sunlight.  | 
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