Photochemical smog is a resultant of the reaction among

a) CO, and O2 and peroxyacetyl nitrate in the presence of sunlight
b) CO, CO2 and NO2 at low temperature
c) high concentration of NO2, O3 and CO in the evening
d) NO2, O3 and Peroxiacetyl nitrate in the presence of sunlight

Ans- d
Explanation-Photochemical smog forms in presence of sunlight, nitrogen oxides and volatile organic compounds like PAN in the atmosphere, which leaves airborne particles and ground-level ozone.

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