Smog that occurs due to low temperature and has reducing environment is

Options

A. London smog
B. Photochemical smog
C. Los Angeles smog
D. All the above

Answer

To solve the question regarding the type of smog that occurs due to low temperature and has a reducing environment, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Types of Smog**:
- There are two main types of smog: classical (London smoke) and photochemical (Los Angeles smoke).

2. **Identify Characteristics of Classical Smog**:
- Classical smog, also known as London smog, is primarily caused by sulfur oxides and occurs in cold, damp conditions. It is characterized by a reducing environment.

3. **Identify Characteristics of Photochemical Smog**:
- Photochemical smog, or Los Angeles smog, is formed from nitrogen oxides and hydrocarbons and occurs in warm, sunny conditions. This type of smog is associated with a more oxidizing environment.

4. **Analyze the Question**:
- The question specifically asks for the type of smog that occurs in low temperature and has a reducing environment. Based on the characteristics discussed, this aligns with classical smog.

5. **Select the Correct Option**:
- The correct answer is option 1: London smoke, as it is the only type of smog that fits the criteria of occurring in low temperature and having a reducing environment.

### Final Answer:
The smog that occurs due to low temperature and has a reducing environment is **London smoke**.

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