How do fossil fuels contribute to pollution? Commet.

Explanation

**Step-by-Step Solution:**

1. **Understanding Fossil Fuels**: Fossil fuels are natural substances formed from the remains of ancient plants and animals. They primarily consist of carbon, nitrogen, sulfur, and hydrocarbons.

2. **Combustion Process**: When fossil fuels are burned (combusted), they react with oxygen in the air. This process can lead to the formation of various pollutants depending on the completeness of the combustion.

3. **Formation of Carbon Monoxide**: In cases of incomplete combustion, carbon from the fossil fuels reacts with oxygen to form carbon monoxide (CO). This is a harmful gas that can lead to health issues and contributes to air pollution.

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