German building systems manufacturer Schüco has developed a textile façade that purifies the air by breaking down harmful nitrogen oxides (NOx). Using sunlight, the façade converts NOx particles into harmless nitrates, which are washed away by rain and serve as natural fertilizer, enriching the soil. Tests show an average NOx reduction of 30%, with higher results on individual days. 

Tested in the Heart of Cologne

Since April 2024, the façade has been on trial in central Cologne, with testing continuing through 2025. The installation consists of two printed membrane surfaces, each measuring 8 x 20 meters, equipped with sensors to measure air quality before and after filtration. The membrane is coated with photocatalytic agents that break down NOx when activated by sunlight. The results are being documented to evaluate the technology’s potential for large-scale urban application.

Following Cologne’s success, several German cities have expressed interest, and Schüco hopes Dutch municipalities will follow suit.

Sustainable Design and Material Circularity

The textile façade aligns with Schüco’s broader sustainability goals. It not only cleans the air but also contributes to energy efficiency—its solar-shading properties help cool the building, while its low heat emission supports urban cooling. The structure incorporates over 4,400 recycled PET bottles, and the aluminium frame consists of 75% recycled material. The system uses no adhesives, ensuring full recyclability at the end of its life cycle.

More Light, Better Performance

Because the process depends on sunlight, the façade’s orientation affects its performance. The current test site faces north—where light levels are relatively low—yet still achieves a 30% reduction in NOx. A south-facing façade with up to three times higher light intensity could perform significantly better.

Design Freedom for Architects

Schüco’s FACID textile façade system combines environmental performance with design flexibility. Architects can customise membrane patterns, textures, and even integrate lighting effects. The modular system enables quick, cost-effective installation—ideal for urban renovations without structural alterations.

Source & photos: Schüco International