What is one way that sulphur dioxide can damage buildings?

Sulphur dioxide can damage buildings primarily by corroding limestone structures. This occurs because sulphur dioxide, when combined with moisture in the air, can form sulphuric acid. This acid is highly corrosive and reacts with the calcium carbonate found in limestone. As a result, this reaction leads to the deterioration of the limestone, causing structural damage over time.

Limestone is commonly used in construction due to its durability and aesthetic appeal, but when exposed to sulphur dioxide emissions, especially in urban environments with high levels of air pollution, the integrity of these buildings can be significantly compromised. This process highlights the importance of understanding the interaction between pollutants and building materials, especially in preserving historical and architectural sites.