Peroxy Acetyl Nitrate, a class of harardous air pollutants, stems from (i) O2 (ii) SOX (iii) NOX (iv) CO (v) HC

Options

A. (i) and (iv)
B. (iii) and (v)
C. (ii) and (iv)
D. (ii) and (v)

Answer

To solve the question regarding the source of Peroxy Acetyl Nitrate (PAN), we will analyze each option provided:

**Step 1: Understanding Peroxy Acetyl Nitrate (PAN)**
- Peroxy Acetyl Nitrate is a hazardous air pollutant that is primarily formed in photochemical smog. It is associated with various health issues, particularly respiratory problems.

**Step 2: Analyzing the Options**
- We have five options to consider: O2 (oxygen), SOX (sulfur oxides), NOX (nitrogen oxides), CO (carbon monoxide), and HC (hydrocarbons).

**Step 3: Evaluating Each Option**
1. **O2 (Oxygen)**:
- Oxygen is a stable gas and does not directly contribute to the formation of PAN. Therefore, it is not a source of PAN.

2. **SOX (Sulfur Oxides)**:
- Sulfur oxides are also stable and do not play a significant role in the formation of PAN. Hence, this option is incorrect.

3. **NOX (Nitrogen Oxides)**:
- Nitrogen oxides, particularly nitrogen dioxide (NO2), are known to react in the atmosphere to form PAN. Therefore, this option is correct.

4. **CO (Carbon Monoxide)**:
- Carbon monoxide does not contribute to the formation of PAN. Thus, this option is incorrect.

5. **HC (Hydrocarbons)**:
- Hydrocarbons are precursors in the formation of PAN, as they react with nitrogen oxides in the presence of sunlight. Therefore, this option is also correct.

**Step 4: Conclusion**
- The correct answers are NOX (option iii) and HC (option v). These two are the major contributors to the formation of Peroxy Acetyl Nitrate.

**Final Answer:**
- The sources of Peroxy Acetyl Nitrate are (iii) NOX and (v) HC.

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