It belongs to the health category of American well construction standards.

Air, water, nutrition, light, health, comfort and spirit. American Healthy Building Standard is a building evaluation system, which aims to improve human health and well-being through the built environment. The building standard of WEL Health L consists of seven categories: air, water, nutrition, light, fitness, comfort and spirit, with the promotion of human health as the starting point. The standard of healthy building was founded by Delos Company and operated and managed by IWBI, the International Institute of Healthy Building.