Living in urban environments, we are surrounded by concrete, traffic, noise and pollution. This is not healthy. It has a profound impact on our physical and mental wellness. Greenery softens this hard environment, acting as a tonic to ease stress and fatigue. Green walls provide a substantial and spiritual connection to nature which is missing in the modern concrete jungle.
Air quality is an important aspect of health and wellness and plants have been proven to filter and remove toxins. They also add energy rich oxygen. With each additional plant these benefits are multiplied. A green wall, with thousands of plants, therefore has a major positive impact. This is explained in more detail under the Indoor Air Quality section. Why is it that people feel more relaxed and less stressed around greenery?
It is most likely due to man’s evolutionary bond with plants. According to some optometrists the human eye can distinguish between 2,000 shades of green, but only 100 shades of red. Through human evolution, recognizing a plant’s shade of green was really important when you were about to eat it or use it for shelter or medicine. This could be one of the reasons why we feel so comfortable around plants.
The NASA Clean Air Study has been led by the National Aeronautics and Space Administration (NASA) in association with the Associated Landscape Contractors of America (ALCA). Its results suggest that certain common indoor plants may provide a natural way of removing toxic agents such as benzene, formaldehyde andtrichloroethylene from the air, helping neutralize the effects of sick building syndrome.
NASA researchers suggest efficient air cleaning is accomplished with at least one plant per 100 square feet of home or office space