1. Smog-Eating Tiles
Specially designed roof tiles and pavements embedded with titanium dioxide break down airborne pollutants using sunlight, turning smog into harmless byproducts while generating small amounts of electricity. Italy has led the way with cities like Milan fitting buildings with these tiles. Compared to traditional roofs, these not only reduce air pollution but help power smart city systems. More on these innovative surfaces can be found at The Guardian.