Why is air pollution considered a threat for the buildings made of marble? Explain.

Explanation

### Step-by-Step Solution:

1. **Understanding Air Pollution**:
- Air pollution refers to the presence of harmful substances in the air, which are known as pollutants. These pollutants can come from various sources, including industrial emissions, vehicle exhaust, and the burning of fossil fuels.

2. **Identifying Key Pollutants**:
- Two significant pollutants that pose a threat to marble buildings are sulfur dioxide (SO₂) and nitrogen dioxide (NO₂). These gases are primarily released from the combustion of fossil fuels, which contain sulfur and nitrogen impurities.

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