Green muffler scheme helps to reduce

Options

A. air pollution
B. noise pollution
C. e-wastes
D. Both (a) and (b)

Explanation

### Step-by-Step Solution:

1. **Understanding the Green Muffler Scheme**:
- The Green Muffler Scheme involves the establishment of green belt vegetation, which consists of rows of trees and shrubs.

2. **Purpose of Green Mufflers**:
- The primary purpose of this scheme is to act as a buffer against environmental pollutants.

3. **Reduction of Air Pollution**:
- The trees and shrubs in the green muffler scheme help absorb harmful gases and particulate matter from the air, thereby reducing air pollution.

4. **Reduction of Noise Pollution**:
- The vegetation also serves as a barrier that absorbs sound, which helps in reducing noise pollution, especially in areas near roads and railways.

5. **Conclusion**:
- Since the Green Muffler Scheme effectively reduces both air pollution and noise pollution, the correct answer to the question is that it helps to reduce both A (air pollution) and B (noise pollution).

6. **Final Answer**:
- Therefore, the answer is option 4: both A and B.