Peroxyacety nitrate (PAN) ,an eye irritant is produced by :

Options

A. organic waste
B. acid rain
C. photochemical smog
D. classical smog

Explanation

To determine the source of Peroxyacetyl Nitrate (PAN), we need to analyze the options provided and understand the formation of PAN.

### Step-by-Step Solution:

1. **Understanding Peroxyacetyl Nitrate (PAN)**:
- PAN is a chemical compound that is known to be an eye irritant. Its chemical structure consists of an acetyl group (derived from acetic acid) and a peroxy linkage connected to a nitrate group.

2. **Analyzing the Options**:
- We have four options to consider:
- A) Organic waste
- B) Acid rain
- C) Photochemical smoke
- D) Classical smoke

3. **Identifying the Source**:
- **Organic Waste**: While organic waste can produce various pollutants, it is not specifically known for producing PAN.
- **Acid Rain**: Acid rain is a result of atmospheric reactions involving sulfur and nitrogen oxides, but it does not directly produce PAN.
- **Photochemical Smoke**: This is a mixture of pollutants formed when sunlight reacts with nitrogen oxides and volatile organic compounds (VOCs). PAN is one of the secondary pollutants formed in this process, along with other compounds like formaldehyde and acrolein.
- **Classical Smoke**: This typically refers to smoke from burning fossil fuels and does not directly lead to the formation of PAN.

4. **Conclusion**:
- Based on the analysis, the correct answer is **C) Photochemical smoke**. This is the source from which Peroxyacetyl Nitrate is produced, making it relevant to the question.

### Final Answer:
**C) Photochemical smoke**