Why is London smog formed in winter while photochemical smog is formed in summer?

Explanation

### Step-by-Step Solution:

1. **Understanding London Smog**:
- London smog, also known as "industrial smog," is primarily formed due to the condensation of sulfuric acid (H₂SO₄) droplets.
- This process occurs when sulfur dioxide (SO₂) is released into the atmosphere, often from burning fossil fuels, and reacts with water vapor in cold weather conditions.

2. **Conditions for London Smog Formation**:
- London smog is more prevalent in winter because the temperatures are lower, which allows for the condensation of sulfuric acid droplets on particulate matter in the air.
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