Among pollutants which has the most lasting effect

Options

A. CO pollution
B. Pesticides
C. Smoke
D. `SO_(2)`

Answer

### Step-by-Step Solution:

1. **Identify the Pollutants**: The question lists four pollutants: carbon monoxide (CO), pesticides, smoke, and sulfur dioxide (SO2).

2. **Understand the Characteristics of Each Pollutant**:
- **Carbon Monoxide (CO)**: A colorless, odorless gas that can cause health issues but typically does not persist in the environment for long periods.
- **Pesticides**: Chemicals used to kill pests, which can have long-lasting effects due to their stability and accumulation in the environment.
- **Smoke**: Composed of various particles and gases, smoke can cause air pollution but is generally transient.
- **Sulfur Dioxide (SO2)**: A gas that can lead to acid rain and respiratory problems but does not have the same long-term accumulation effects as pesticides.

3. **Evaluate the Lasting Effects**:
- Pesticides are known to persist in the environment, accumulating in soil and water bodies. They can lead to soil acidification and bioaccumulation in the food chain, affecting various organisms and potentially causing health issues in humans.

4. **Conclusion**: Among the listed pollutants, pesticides have the most lasting effect due to their ability to remain in the environment, accumulate in ecosystems, and pose health risks over time.

5. **Final Answer**: The pollutant with the most lasting effect is **pesticides**.