Protect floors and nearby surfaces (this method gets messy). Spray water on a small section of the wall and let it soak in for about 10 to 15 minutes. Once softened, gently scrape off the texture ...

Its moss walls, called CityTrees, are roughly 4 square metres in size. It says they can filter up to 80 per cent of pollution particles out of the air, including the tiny ones linked to ...