Name the substances which contamina the air.

Options

A. Air pollutant
B. Water polluta
C. Land pollutant
D. None of these

Answer

### Step-by-Step Solution:

1. **Understanding Air Pollution**: Air pollution refers to the presence of harmful substances in the atmosphere that can cause adverse effects on human health and the environment.

2. **Identifying Air Pollutants**: Various substances can contaminate the air. These substances are known as air pollutants.

3. **Common Air Pollutants**:
- **Particulate Matter (PM)**: Tiny particles or droplets in the air that can be inhaled and cause health issues.
- **Nitrogen Oxides (NOx)**: Gases produced from vehicle emissions and industrial processes.
- **Sulfur Dioxide (SO2)**: A gas produced by burning fossil fuels, particularly coal and oil.
- **Carbon Monoxide (CO)**: A colorless, odorless gas produced by incomplete combustion of fossil fuels.
- **Volatile Organic Compounds (VOCs)**: Organic chemicals that can evaporate into the air and contribute to air pollution, often found in paints and solvents.
- **Ozone (O3)**: While beneficial in the upper atmosphere, ground-level ozone is a harmful pollutant formed by reactions between sunlight and pollutants like VOCs and NOx.
- **Lead**: A heavy metal that can contaminate the air, often from industrial sources or leaded gasoline.

4. **Conclusion**: The substances that contaminate the air include particulate matter, nitrogen oxides, sulfur dioxide, carbon monoxide, volatile organic compounds, ozone, and lead.