Which document requires kindergartens to have sand pools?

Shanghai Kindergarten School Grade Standard (Trial). Whether kindergartens have sand pools has been regarded as a basic facilities and equipment scoring item in the school-running grade standard of kindergartens in Shanghai. The importance of playing with sand has been widely recognized. In the equipment standard of preschool education institutions, it is proposed that outdoor natural amusement areas should be opened for playing with sand. If the space is limited, it can be equipped with movable facilities to play with sand and water to ensure the development of children playing with sand and water. It can be seen that playing with sand has been paid more and more attention by the preschool education community.