Open air school

The "open-air crusaders" of Elizabeth McCormick Open air School, Chicago, USA, 1911
Open air school in the Netherlands, 1918

Open air schools or schools of the woods were purpose-built educational institutions for children, that were designed to prevent and combat the widespread rise of tuberculosis that occurred in the period leading up to the Second World War. The schools were built to provide open-air therapy so that fresh air, good ventilation and exposure to the outside would improve the children's health. The schools were mostly built in areas away from city centers, sometimes in rural locations, to provide a space free from pollution and overcrowding. The creation and design of the schools paralleled that of the tuberculosis sanatoriums, in that hygiene and exposure to fresh air were paramount.