People take more than 20,000 breaths a day , and
we live an estimated 90 % of our lives indoors .
Good daylight conditions improve health, wellbeing
and performance  in general, and children’s learning
abilities rise by up to 15 % if they are in a good
indoor climate . Thus, living a healthy life is closely
related to living in a healthy indoor environment.
A number of scientific studies point out that a
healthy and comfortable indoor environment is
one which is ventilated, and that lets in daylight.
Science and citizens agree.
35% of Europeans give the highest importance to both fresh air and daylight when asked what is important to their health. 65% Europeans give next to or highest importance to both.
Source: Healthy Homes Barometer 2015, An annual study of European citizens’ attitudes and behaviour regarding
home comfort, energy consumption and environmental impact, The Healthy Homes Barometer is accompanied academically by Prof. Dr. Dr. h. c. Bernd Wegener, Humboldt University Berlin.
 American Lung Association: www.lung.org/your-lungs
 NEST project, Technical University of Berlin, European Commission 2004.
 L. Heschong: ”Daylighting and Human Performance”, ASHRAE Journal, vol. 44, no. 6, pp. 65-67, 2002.
 “Indoor Environment and Learning in Schools”, International Centre for Indoor Environment and Energy (ICIEE), Technical University of Denmark, 2013.