The VELUX Days 2019 took place in Paris on the 9th and 10th October 2019. The two-day event focused on two topics driving current industry trends: natural light, during the VELUX Daylight Symposium on the first day, and healthy buildings, on the VELUX Healthy Buildings Day on 10th of October. The event put the focus on a complex and challenging issue that VELUX is tackling: how can buildings truly support human needs while also being healthy, energy efficient and sustainable. To analyse the topic, VELUX publishes each year a report collecting data and cutting-edge research inputs on the importance of IEQ in buildings for the occupants well being. The Healthy Homes Barometer 2019, exploring the great potential benefits that improved indoor conditions in homes across Europe could have on health, learning, productivity, was presented in Paris during the Healthy Buildings Day on the 10th October.