Write the name of an air pollutant.

Explanation

### Step-by-Step Solution:

1. **Identify Air Pollutants**: Air pollutants are substances in the air that can cause harm to humans, animals, and the environment. They can be in the form of gases, particles, or biological molecules.

2. **List Common Air Pollutants**: Some common air pollutants include:
- Nitrogen Dioxide (NO2)
- Sulfur Dioxide (SO2)
- Carbon Dioxide (CO2)
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