To achieve this, the room temperature in all public buildings will be reduced to the minimum level of 20 degrees Celsius prescribed by occupational health and safety law. In stairwells and corridors the thermometer should not exceed 16 degrees, in gymnasiums 17 degrees. At night and on weekends, the temperatures should be even lower, if possible. Exceptions to these rules are foreseen, for example, for police and fire brigade offices, for schools, day-care centres or for the protection of cultural collections.