he main component of photochemical smog isans.Sulphur dioxideAll of the aboveOxides of nitrogenWater vapour

The main component of photochemical smog is Oxides of Nitrogen.

Here's a step-by-step explanation:

1. Photochemical smog, also known as "Los Angeles smog," occurs when sunlight reacts with nitrogen oxides and at least one volatile organic compound (VOC) in the atmosphere.

2. Nitrogen oxides come from car exhaust, coal power plants, and factory emissions. VOCs are released from gasoline, paints, and many cleaning solvents.

3. When sunlight hits these chemicals, they form airborne particles and ground-level ozone—or smog.

So, among the options given, Oxides of Nitrogen is the correct answer as it is a primary component involved in the formation of photochemical smog.