Which specific green building rating system places its primary emphasis on the health and well-being of building occupants?

The specific green building rating system that places its primary emphasis on the health and well-being of building occupants is the WELL Building Standard. A green building rating system is a set of criteria and guidelines used to assess and certify a building's environmental performance and sustainability. While many green building systems incorporate health aspects, the WELL Building Standard is uniquely and fundamentally centered on improving human health and wellness through the built environment. It is a performance-based certification, meaning it evaluates the actual impact of a building's design, construction, and operations on its occupants' health and comfort, rather than just design intentions. The standard achieves this by addressing ten core concepts that directly influence human health: Air, Water, Nourishment, Light, Movement, Thermal Comfort, Sound, Materials, Mind, and Community. For instance, under the Air concept, the standard sets strict requirements for indoor air quality by specifying ventilation rates and pollutant thresholds, aiming to reduce respiratory issues. Under the Light concept, it encourages access to natural light and regulates artificial lighting to support circadian rhythms and visual comfort. Each concept includes specific features and requirements designed to enhance physical and mental health, making the WELL Building Standard the definitive system for prioritizing occupant well-being.