Air pollution leads to global warming, acid rain, ozone depletion and a wide variety of respiratory diseases. Which of the following activities does not contribute to air pollution?

Options

A. Mining of heavy metals
B. Exhaust from motor vehicles
C. Application of fertilizers to soil
D. Emission of CFC's in the atmosphere

Answer

To determine which activity does not contribute to air pollution, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding Air Pollution**:
- Air pollution refers to the presence of harmful substances in the air, which can lead to global warming, acid rain, ozone depletion, and respiratory diseases.

2. **Analyzing the Options**:
- **Option A: Mining of Heavy Metals**:
- Mining involves the extraction of minerals from the earth, which generates a significant amount of dust and releases various gases into the atmosphere. Therefore, mining contributes to air pollution.

- **Option B: Exhaust from Motor Vehicles**:
- Motor vehicles emit exhaust gases when fuel is burned. This exhaust contains pollutants such as carbon monoxide, nitrogen oxides, and particulate matter, all of which contribute to air pollution.

- **Option C: Applications of Fertilizer to Soil**:
- Fertilizers are applied to enhance crop yield. While excessive use can lead to soil and water pollution, it does not directly contribute to air pollution. The primary concern with fertilizers is their impact on soil and water quality, not air quality.

- **Option D: Emission of CFCs in the Atmosphere**:
- Chlorofluorocarbons (CFCs) are chemicals used in refrigeration and aerosol sprays. They are known to deplete the ozone layer and contribute to air pollution.

3. **Conclusion**:
- After analyzing all the options, the activity that does not contribute to air pollution is **Option C: Applications of Fertilizer to Soil**.

### Final Answer:
**The activity that does not contribute to air pollution is the application of fertilizer to soil.**

---