According to central pollution Contril Board [CPCB] what size (in diameter) of particulate is responsiblefor causing greater harm to human health?

Options

A. `3.5 micrometers`
B. `2.5 micrometers`
C. `4.0 micrometers`
D. `3.0 micrometers`

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the size of particulate matter that is responsible for causing greater harm to human health according to the Central Pollution Control Board (CPCB).

2. **Identifying the Relevant Information**: The CPCB has specified a particular size of particulate matter that poses significant health risks. This information is crucial for answering the question accurately.

3. **Recalling the Size of Particulate Matter**: The size of particulate matter that is most harmful to human health is 2.5 micrometers (µm) in diameter. This size is commonly referred to as PM2.5.

4. **Explaining the Health Impacts**: Particulate matter of this size can be inhaled into the lungs and can cause various respiratory issues, including irritation, inflammation, and even damage to lung tissue. Prolonged exposure can lead to serious health consequences, including premature death.

5. **Conclusion**: Therefore, according to the CPCB, the size of particulate matter that is responsible for causing greater harm to human health is 2.5 micrometers in diameter.

### Final Answer:
The size of particulate matter responsible for causing greater harm to human health, according to the Central Pollution Control Board (CPCB), is **2.5 micrometers (µm)** in diameter.

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