Which is not a source of pollution ?

Options

A. Forest fire
B. Coal fire
C. Volcanoes
D. Dust storm

Answer

To determine which option is not a source of pollution, we can analyze the different options provided in the question. Here’s a step-by-step solution:

### Step 1: Identify the options
First, we need to identify the options provided in the question. For this example, we will consider the following:
- A) Dust storm
- B) Forest fire
- C) Coal combustion
- D) Volcanic eruptions

### Step 2: Analyze each option
Next, we will analyze each option to see if it contributes to pollution.

- **Dust Storm**: A dust storm occurs when strong winds lift large amounts of dust and sand into the atmosphere. While it can affect air quality, it does not produce harmful chemical pollutants like sulfur oxides or nitrogen oxides.

- **Forest Fire**: Forest fires release smoke and various pollutants, including carbon monoxide, particulate matter, and other harmful chemicals into the atmosphere.

- **Coal Combustion**: Burning coal releases a variety of pollutants, including sulfur dioxide (SO2), nitrogen oxides (NOx), and particulate matter, which contribute to air pollution.

- **Volcanic Eruptions**: Volcanoes can emit sulfur dioxide and other gases, contributing to air pollution and acid rain.

### Step 3: Conclusion
From the analysis, we can conclude that the dust storm is not a source of chemical pollution like the other options. It primarily involves the physical movement of dust and does not introduce harmful chemicals into the environment.

Therefore, the correct answer is:
**A) Dust Storm**