Topical Sessions Airborne cross infection and engineering solutions Building and ductwork airtightness regulations in various countries Energy Performance of Gas Phase Air Cleaning Importance of good resilient building design and standards to ensure good vc performance to reduce overheating and environmental impact Personalized Environmental Control Systems (PECS) operation and evaluation Real performance of (smart) residential ventilation - performance assurance, fault detection, continuous commissioning Revision of ISO 9972 Improvements in the reliability of airtightness measurements Summer comfort and energy efficiency in hot periods: interest of mixed mode cooling and need for occupant feedback The Role of Building Ventilation on Building Decarbonization The role of carbon dioxide and particulate matter for assessing ventilation and respiratory disease transmission in buildings Post Pandemic Pontifications Resilient Cooling of Buildings meets Resilient Cooling in Cities - Interactive Session