The main component of photochemical smog isans.Water vapour Sulphur dioxideAll of the aboveOxides of nitrogen Previous Marked for Review Next

The main component of photochemical smog is Oxides of Nitrogen.

Here's a step-by-step explanation:

1. Photochemical smog is a type of air pollution that is a result of the interaction between sunlight and certain chemicals in the atmosphere.

2. The primary components of photochemical smog are Nitrogen Oxides (NOx), Volatile Organic Compounds (VOCs), and ozone.

3. Nitrogen Oxides are released into the atmosphere primarily through the burning of fossil fuels, such as in car engines and power plants.

4. When Nitrogen Oxides and Volatile Organic Compounds come into contact with sunlight, they undergo a series of chemical reactions to form secondary pollutants, including ozone.

5. This ozone, along with the other secondary pollutants, forms a hazy, smoggy layer in the atmosphere, which is what we refer to as photochemical smog.

So, the correct answer to your question is Oxides of Nitrogen.