Which gases are responsible for acid rain?

Explanation

### Step-by-Step Solution:

1. **Identify Acid Rain**: Acid rain is a type of precipitation that contains higher levels of hydrogen ions (low pH), making it more acidic than normal rainwater.

2. **Recognize the Gases Involved**: The primary gases responsible for acid rain are:
- **Sulphur Dioxide (SO2)**: This gas is produced from burning fossil fuels, industrial processes, and volcanic eruptions.
- **Nitrogen Oxides (NOx)**: This includes various nitrogen oxides, primarily produced from vehicle emissions and industrial activities.

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