AirBubble, the architectural project, is capable of absorbing air pollutants and carbon dioxide and producing oxygen by using 520 liters of living green algae. /CFP

Children interact with water foot pumps, bouncy bubbles and a rope system at the venue. /CFP

Warsaw was selected for this project as it ranks 269th for air quality on a list of 323 European cities, per data from the European Environment Agency. /CFP

Air pollution is the biggest health threat around the globe, according to the World Health Organization. /CFP