which of the following is not categorised as particulate pollutant ?

Options

A. Dust
B. Smoke
C. Fumes
D. Carbon dioxde

Answer

To determine which of the following options is not categorized as a particulate pollutant, we first need to understand what particulate pollutants are.

### Step-by-Step Solution:

1. **Definition of Particulate Pollutants**:
Particulate pollutants are defined as minute solid particles or liquid droplets that are suspended in the air. They can be either solid particles, liquid droplets, or a mixture of both.

2. **Types of Particulate Pollutants**:
- **Mist**: Formed by the condensation of vapors in the air. These are considered particulate pollutants because they consist of tiny liquid droplets.
- **Smoke**: Composed of very small particles that can be either solid or liquid, produced by burning organic matter.
- **Fumes**: These are condensed vapors, often from metals, and are released during chemical processes or metallurgy.
- **Dust**: Fine particles formed from the natural disintegration of rocks and soil.

3. **Identifying Non-Particulate Pollutants**:
Now, we need to identify which option does not fit into the category of particulate pollutants. Common examples of air pollutants include gases such as carbon dioxide (CO2), sulfur dioxide (SO2), and nitrogen oxides (NOx).

4. **Conclusion**:
Among the options provided, carbon dioxide is a gas and does not fall under the category of particulate pollutants. Therefore, it is the correct answer to the question.

### Final Answer:
The substance that is not categorized as a particulate pollutant is **carbon dioxide**.

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