Which oxide of nitrogen is not a common pollutant introduced into the atmosphere both due to natural and human activity?

Options

A. `N_(2)O`
B. `NO_(2)`
C. `N_(2)O_(5)`
D. `NO`

Explanation

To solve the question of which oxide of nitrogen is not a common pollutant introduced into the atmosphere due to natural and human activity, we will analyze each of the given options:

1. **N2O (Nitrous Oxide)**:
- N2O is commonly known as laughing gas. It is a greenhouse gas and contributes to ozone depletion. It is released into the atmosphere from both natural sources (like soil and oceans) and human activities (such as agriculture and fossil fuel combustion). Therefore, N2O is considered a common pollutant.

2. **NO2 (Nitrogen Dioxide)**:
- NO2 is a significant air pollutant that results from combustion processes, such as those in vehicles and power plants. It is harmful to human health and the environment, making it a common pollutant.

3. **N2O5 (Dinitrogen Pentoxide)**:
- N2O5 is not commonly found in the atmosphere and is not typically classified as a pollutant. It is formed from the reaction of nitrogen oxides (NOx) and is more relevant in the context of chemical reactions rather than as a direct pollutant.

4. **NO (Nitric Oxide)**:
- NO is another important pollutant that is produced from combustion processes and contributes to the formation of smog and acid rain. It is widely recognized as a common pollutant.

After analyzing all the options, we conclude that the oxide of nitrogen that is not a common pollutant introduced into the atmosphere is **N2O5**.

**Final Answer**: N2O5 (Nitrogen Pentoxide)