What is the composition of London smog ?

Explanation

### Step-by-Step Solution:

1. **Understanding London Smog**:
- London smog is a type of air pollution that is characterized by a thick fog combined with smoke and other pollutants.

2. **Key Components**:
- The main components of London smog include sulfur dioxide (SO₂), sulfur trioxide (SO₃), water droplets (H₂O), and carbon particulates.

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