In which season and what time of the day, there is 'London smog'

Explanation

**Step-by-Step Solution:**

1. **Identify the phenomenon:** The question asks about 'London smog', which is a type of air pollution that has historically affected London.

2. **Determine the season:** London smog is most commonly associated with the winter season. This is due to increased use of coal for heating during colder months, which contributes to higher levels of air pollution.

3. **Identify the time of day:** The smog is typically observed during the morning hours. This is when temperature inversions are more likely to occur, trapping pollutants close to the ground and leading to the formation of smog.

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