1 Scope
2 References
3 Definitions
3.1 Terms defined elsewhere
3.2 Terms defined in this Supplement
4 Abbreviations and acronyms
5 Conventions
6 Concept of digital twins in smart sustainable cities
6.1 Concept
6.2 Benefits
7 Use cases of a digital twin in smart sustainable cities
7.1 Smart firefighting
7.2 Air quality management
7.3 Response to infectious diseases
8 Challenges and opportunities
9 Observations and suggestions
Bibliography