Indoor health and comfort in European buildings are severely lagging. One in four Europeans resides in buildings where indoor air quality falls below national standards and more than 30 million citizens are affected by their dwellings being too dark, which can negatively impact both mental and physical health. In this context, the 2024 Healthy Buildings Barometer (HBB) launches today with a clear message: Action is needed at EU and national level to deliver healthy homes, workplaces, schools and hospitals.