Humans spend 90% of their time in buildings According to a study by the World Health Organization, humans spend an average of 90% of their lives in buildings, including homes, offices, schools, hospitals, and shopping malls. This shows the importance of the living environment for human health and quality of life. Ensuring a comfortable and safe living environment A comfortable and safe living environment is one that meets the health, mental, and physical needs of humans. Specifically, a comfortable living environment must ensure the following factors: Air quality: Indoor air must be clean, free of pollutants, and contain enough oxygen to breathe. Natural lighting: Natural lighting helps humans feel comfortable, relaxed, and improve their health. Temperature and humidity: The temperature and humidity in...