Reducing Air Pollution
Green roofs can help to reduce urban air pollution, and so help fight against respiratory disease and breathing difficulties.
Vegetation in urban areas filters out fine airborne particles as the air passes over the plants, settling on to leaf surfaces.
This will then be washed into the substrate through the movement of rainwater, capturing dust particles in the environment.
The plants in a green roof can remove certain pollutants from the air. Green roofs remove gaseous pollutants including nitrogen oxides, sulphur dioxide, carbon monoxide and ground level ozone from the air.
Foliage absorbs gaseous pollutants, isolating the material in their tissues. Green roofs are a potential carbon sink and can remove carbon dioxide and produce oxygen.