Why has restoration of saint pauls cathedral been necessary in recent years?

The restoration of St. Paul's Cathedral has been necessary in recent years due to concerns over structural integrity, weather-related damage, and pollution-related deterioration. Extensive maintenance efforts have aimed to preserve its iconic features, such as the dome and stonework, while addressing issues like leaks and erosion. Additionally, the restoration ensures the cathedral remains safe for the public and continues to serve its role as a significant historical and cultural landmark.