PAN and Nox are components of

Options

A. Acid rain
B. Photochemical smog
C. CFCs
D. ODS

Answer

**Step-by-Step Solution:**

1. **Understanding PAN and NOx:**
- PAN stands for Peroxyacetyl Nitrate, which is a secondary pollutant.
- NOx refers to nitrogen oxides, which include nitrogen monoxide (NO) and nitrogen dioxide (NO2).

2. **Identifying the Nature of PAN and NOx:**
- Both PAN and NOx are classified as secondary pollutants. This means they are not directly emitted but are formed through chemical reactions in the atmosphere.

3. **Formation of PAN:**
- PAN is formed through photochemical reactions involving hydrocarbons and nitrogen oxides. These reactions occur in the presence of sunlight (UV radiation).

4. **Role of UV Radiation:**
- UV rays interact with pollutants in the atmosphere, leading to the formation of various secondary pollutants, including PAN.

5. **Components of Photochemical Smoke:**
- The formation of PAN and the presence of NOx are significant components of photochemical smoke, which is a type of air pollution that occurs in urban areas.

6. **Evaluating the Options:**
- The question provides four options regarding the components of PAN and NOx:
1. Acid Rain
2. Photochemical Smoke
3. CFC (Chlorofluorocarbons)
4. ODS (Ozone Depleting Substances)

7. **Eliminating Incorrect Options:**
- Acid Rain: While NOx contributes to acid rain, PAN is not a direct component of it.
- CFC: These are not related to PAN and NOx.
- ODS: These are substances that deplete the ozone layer and are not directly related to PAN and NOx.

8. **Conclusion:**
- The correct answer is that PAN and NOx are components of **Photochemical Smoke**.

**Final Answer: Photochemical Smoke**

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