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Boysen and its creative agency painted one-square-meter artworks along Manila’s busiest and most treeless highways.

They were painted using KNOxOUT, Boysen’s special smog-eating paint that cleaned the air. One square meter of Boysen KNOxOUT painted surface cleans as much nitrogen oxide as one mature tree.

The artworks consisted of striking and colorful portraits of rubber ducks, birds, food, toys, and other objects. But because they were painted with air-cleaning KNOxOUT paint, each one was, indeed, a tree.