Answer
Photochemical smog results from the action of sunlight on NO, commonly observed in cities with high pollution rate. This is a stagnant mass of polluted air containing a mixture of NO and Ozone. NO is mainly produced from burning of fossil fuels such as petroleum. Then NO reacts with Oxygen in air to form NO2. This NO2 is dissociated by sunlight into NO and O, which forms Ozone. Chemical equations are:
$2NO + O_{2} → 2NO_{2}$
$NO_{2} + hv → NO + O$
$O + O_{2} + M → O_{3} + M*$ (M = atmospheric gases)
Work Step by Step
Given above.
