yumz!

In several Serbian cities, a new kind of urban installation is quietly helping to improve air quality. Known as “liquid trees,” these structures are transparent tanks filled with water and microalgae. While they may look like modern sculptures in public spaces, their purpose is environmental. The algae inside absorb carbon dioxide from the surrounding air and release oxygen through photosynthesis, working much like natural trees but in a compact, controlled system.

The concept is especially useful in dense city areas where planting large numbers of trees may not be possible. Busy intersections, narrow streets, and heavily built environments often lack space for traditional greenery. Liquid trees provide an alternative by using biotechnology to mimic the air-cleaning benefits of plants in places where soil and space are limited.

Beyond improving air quality, these installations also raise awareness about sustainable solutions for urban pollution. Passersby often stop to observe the bubbling green tanks and learn about how the system works. In blending science, design, and environmental responsibility, Serbia’s liquid trees demonstrate how cities can creatively address pollution while reimagining what urban “green spaces” can look like.

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