Different Types of Schools, 1957
The age of open-air schools was so long ago that it seems like it never happened. These types of schools were seen throughout several European countries, leading up to the Second World War. They were designed to prevent the widespread rise of tuberculosis that occurred during that time.
It was believed by many that fresh air improved health, so schools were built away from cities, in rural areas to help facilitate this new theory, and to also provide a space that is free from overcrowding and pollution. By the mid-1970s, most of those schools were shut down.