Smog is :

Question

Smog is :

Accepted Answer

Smog is a type of air pollution that is characterized by a combination of smoke and fog, which is why Option 3, "Fog and smoke," is the correct answer.

1. **Explanation for Option 3 (Correct Answer):**
   - Smog is formed when smoke, which contains various pollutants such as particulate matter and chemicals from industrial emissions and vehicle exhaust, combines with fog, which is essentially water droplets suspended in the air. This combination creates a thick, hazy layer that reduces visibility and can have harmful effects on health and the environment. The term "smog" itself is a portmanteau of "smoke" and "fog," highlighting the components that make up this type of pollution.

2. **Explanation for why other options are incorrect:**
   - **Option 1: Ozone and smoke**
     - While ozone can be a component of air pollution, smog specifically refers to the combination of smoke and fog. Ozone is a secondary pollutant that can be present in smog, particularly in photochemical smog, but it is not a defining component of the traditional smog described in Option 3.
   
   - **Option 2: Vehicular pollutant**
     - Although vehicular pollutants contribute to the formation of smog, they are not the sole components. Smog is specifically the mixture of smoke and fog, not just pollutants from vehicles. Therefore, this option does not accurately describe what smog is.
   
   - **Option 4: Fog and ozone**
     - This option incorrectly identifies the components of smog. While ozone can be present in certain types of smog, the traditional definition of smog involves smoke, not ozone. Fog and ozone alone do not constitute smog.

In conclusion, Option 3, "Fog and smoke," accurately describes the components of smog, making it the correct answer.