From 1 April 2017, childcare must comply with the 2012 Building Decree, which is a good thing because studies from various GGDs show that the air quality in many childcare centers can be improved (source: GGD). Stricter requirements for air quality and ventilation are described in the new 2012 Building Decree. New requirements and legislation always raise questions, especially when it comes to air quality. In childcare, the indoor air is continuously polluted by odors, fine dust, micro-organisms, bacteria and viruses. This is unhealthy for both children and employees. It can cause illnesses, lung problems and allergic reactions.