Explain the differences between pure air and polluted air.

Explanation

### Step-by-Step Text Solution:

1. **Definition of Pure Air**:
- Pure air is a mixture of gases that is essential for life. It primarily consists of:
- **78% Nitrogen (N₂)**
- **21% Oxygen (O₂)**
- **0.03% Carbon Dioxide (CO₂)**
- Additionally, it contains trace amounts of other gases such as argon, methane, ozone, and water vapor.
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