Smog is produced due to

Options

A. Air and metal dust
B. Water and nitrogen oxide
C. Smoke and fog
D. None of the above

Answer

**Step-by-Step Solution:**

1. **Understanding Smog**: Smog is a type of air pollution that is characterized by a mixture of smoke and fog. It is important to recognize that smog is not just one element but a combination of various pollutants.

2. **Origin of the Term**: The term "smog" is derived from the combination of two words: "smoke" and "fog." This indicates that smog has properties of both smoke (which contains harmful pollutants) and fog (which is a weather phenomenon).

3. **Components of Smog**: Smog typically contains various pollutants including nitrogen oxides, sulfur oxides, and dust particles. These components contribute to the harmful effects of smog on health and the environment.

4. **Identifying the Correct Option**: Given the options:
- A) Air and metal dust
- B) Water and nitrogen oxide
- C) Smoke and fog
- D) None of the above

The most accurate description of what produces smog is found in option C, which states that smog is produced due to "smoke and fog."

5. **Conclusion**: Therefore, the correct answer to the question "Smog is produced due to" is option C: smoke and fog.

---