Oxides of sulphur and nitrogen are important pollutants of :

Options

A. Water
B. air
C. Soil
D. All of the above

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the pollutants that include oxides of sulfur and nitrogen. We need to identify the environment (water, air, soil, or all of the above) that is primarily affected by these pollutants.

2. **Identifying Pollutants**: Oxides of sulfur (like sulfur dioxide) and nitrogen (like nitrogen oxides) are known to be harmful substances released into the environment.

3. **Analyzing the Options**:
- **Water**: While sulfur and nitrogen oxides can contribute to water pollution, they are not the primary pollutants in this context.
- **Air**: These oxides are significant contributors to air pollution, leading to health issues and environmental problems such as acid rain.
- **Soil**: Sulfur and nitrogen oxides do not primarily cause soil pollution; other substances are more responsible for this type of pollution.

4. **Conclusion**: Based on the analysis, the primary environment affected by oxides of sulfur and nitrogen is the air.

5. **Final Answer**: Therefore, the correct option is **air**.