Which pollutant mainly affect the respiratory system in human and animals ?

Options

A. Suspended particulate matter in Air
B. Nitrate pollution in water
C. DDT pollution in soil
D. Hg in water

Answer

### Step-by-Step Solution:

1. **Understanding Pollutants**: Pollutants are substances that cause pollution and can have harmful effects on the environment and living organisms, including humans and animals.

2. **Identifying Types of Pollution**: The question presents different types of pollutants: suspended particulate matter in air, nitrate pollution in water, DDT pollution in soil, and mercury in water.

3. **Focusing on the Respiratory System**: The question specifically asks about pollutants that affect the respiratory system. Therefore, we need to focus on air pollutants rather than those affecting water or soil.

4. **Recognizing Suspended Particulate Matter**: Among the listed pollutants, suspended particulate matter (PM) in the air is known to have a significant impact on the respiratory system. These tiny particles can be inhaled and can cause various respiratory disorders.

5. **Conclusion**: The main pollutant that affects the respiratory system in humans and animals is **suspended particulate matter**.