To use urban land for a pond, in fact as an open air swimming pool is novel. It looked rather cold, but maybe in Kings Cross as it is North London, near to Hampstead ponds they are hardy folk? The water is recycled. There are also fountains in front of the renovated Granary Store and children enjoy running through them as they do in the Somerset House courtyard fountains.
Kings Cross has appropriate new street trees, you can see some here behind the swimming pond – London Planes that breathe and shed their bark to keep them safe from pollution. Recent studies are suggesting Natural Health Improvement Zones with extensive tree planting to improve urban air quality.