The Longest and Healthiest Day of the Year

In many parts of the world, the 21st of June marks the longest day of the year. Apart from offering more hours with daylight, this day could also very well be regarded as the healthiest day of the year, because the increased exposure to daylight and fresh air strengthens our immune defence - making us less prone to illness. In the video Per Arnold Andersen from the VELUX Group Daylight Knowledge Centre explains how daylight and natural ventilation affect our general health and mood.