Photochemical smog occurs in warm, dry and sunny climate, One of the following is not amongst the components of photochemical smog, identify it.

Options

A. `NO_(2)`
B. `O_(3)`
C. `SO_(2)`
D. Unsaturated hydrocarbon

Explanation

To solve the question regarding the components of photochemical smog, we will follow these steps:

### Step 1: Understand Photochemical Smog
Photochemical smog, also known as summer smog, occurs in warm, dry, and sunny climates. It is formed primarily in the presence of sunlight (UV radiation).

**Hint:** Remember that photochemical smog is associated with sunlight and specific pollutants.

### Step 2: Identify Key Components of Photochemical Smog
The main components contributing to photochemical smog include:
- Nitrogen dioxide (NO2)
- Hydrocarbons
- Ozone (O3)
- Peroxyacetyl nitrate (PAN)
- Aldehydes
- Ketones

**Hint:** Focus on the pollutants that are typically involved in the formation of smog.

### Step 3: Analyze the Given Options
We need to determine which option is NOT a component of photochemical smog. The common components include NO2, hydrocarbons, O3, PAN, aldehydes, and ketones.

**Hint:** Compare the options provided with the list of known components of photochemical smog.

### Step 4: Identify the Incorrect Component
Among the common pollutants, sulfur dioxide (SO2) is not a component of photochemical smog. Instead, it is associated with industrial smog, which occurs in colder, humid conditions.

**Hint:** Recall that SO2 is typically linked to industrial activities and not to the photochemical reactions that create smog in sunny conditions.

### Conclusion
The component that is NOT part of photochemical smog is **sulfur dioxide (SO2)**.

**Final Answer:** SO2