Troposphere pollutant contains.

Options

A. Dust
B. Water vapours
C. Mist
D. All of these

Answer

To answer the question about what pollutants are found in the troposphere, we can break down the components typically present in this layer of the atmosphere.

### Step-by-Step Solution:

1. **Understanding the Troposphere**:
- The troposphere is the lowest layer of Earth's atmosphere, extending from the surface up to about 10 kilometers above sea level. It contains the majority of the atmosphere's mass.

2. **Components of the Troposphere**:
- The troposphere is composed of various elements, including gases, dust, water vapor, and aerosols.

3. **Dust**:
- Dust particles are small solid particles that are suspended in the air. They can originate from various sources, including soil erosion, construction activities, and natural events like volcanic eruptions.

4. **Water Vapor**:
- Water vapor is the gaseous form of water and is a significant component of the troposphere. It is responsible for weather phenomena and constitutes about 99% of the total mass of water vapor in the atmosphere.

5. **Mist**:
- Mist refers to tiny droplets of water suspended in the air, which can form when water vapor condenses. It is also considered an aerosol, which is a mixture of solid and liquid particles in the air.

6. **Conclusion**:
- Given that the troposphere contains dust, water vapor, and mist, the correct answer to the question "Troposphere pollutant contains" is **all of these** (option D).

### Final Answer:
The troposphere pollutant contains:
- Dust
- Water vapor
- Mist
- Therefore, the correct option is **all of these**.

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