Why is acid rain considered a threat to Taj Mahal ?

Explanation

**Step-by-Step Solution:**

1. **Understanding the Composition of the Taj Mahal:**
- The Taj Mahal is primarily made of marble, which is chemically known as calcium carbonate (CaCO3).

2. **Identifying the Components of Acid Rain:**
- Acid rain is formed when sulfur dioxide (SO2) and nitrogen oxides (NOx) are released into the atmosphere, where they react with water vapor to form sulfuric acid (H2SO4) and nitric acid (HNO3).

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