EU Member States have been developing policies and measures to reduce the energy consumption of their buildings. The Energy Performance Buildings Directive (2010/31/EU) requires Member States to consider how high-energy performance impacts general indoor climate conditions, to avoid possible negative effects such as inadequate ventilation or poor indoor air quality. This report reviews the existing studies, reports and investigations which have been examining the impact of high energy performance on indoor air quality. Moreover it provides recommendations on how to establish healthy and energy-efficient buildings in the European Union.EU Member States have been developing policies and measures to reduce the energy consumption of their buildings.