Why is acid rain considered as a threat to 'Taj Mahal' ?

Explanation

### Step-by-Step Solution:

1. **Understanding Acid Rain**:
- Acid rain is formed when sulfur oxides (SOx) and nitrogen oxides (NOx) are released into the atmosphere. These compounds can come from sources such as automobile exhaust and industrial emissions.

2. **Formation of Acids**:
- When sulfur dioxide (SO2) and nitrogen oxides (NOx) react with water vapor and oxygen in the atmosphere, they form sulfuric acid (H2SO4) and nitric acid (HNO3).
- Additionally, carbon dioxide (CO2) can also react with water to form carbonic acid (H2CO3).
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