A team from ETH Zurich has developed a sustainable, passive method for dehumidifying indoor spaces. Their approach uses hygroscopic materials, like marble quarry waste combined with a geopolymer binder, to absorb moisture in walls and ceilings. 

This moisture is temporarily stored and released when ventilated. The technique, tested through simulations in a library, significantly reduces humidity and discomfort. 

The components, produced with 3D printing, are more climate-friendly than traditional ventilation systems. Compared to clay plaster, the new material has higher moisture storage capacity, contributing to lower greenhouse gas emissions in building construction.