The newest decoration (I myself cannot call that humongous structure a “mesh”) that is currently being constructed around a Mexico City hospital, designed by the Berlin firm Elegant Embellishments, tackles the smog problem in two separate ways. First, and most obvious, is its design. As Elegant Embellishments’ co-founder Allison Dring told Co.Exist, the wall’s many oddly shaped holes actually slow down wind and create turbulence to force as much air as possible through the enormous filter. Then there’s the real ‘environmental remediation’ workhorse: a coating of titanium dioxide. When the coating comes in contact with smog, it breaks down the pollutants into simpler, harmless parts like calcium nitrate, carbon dioxide, and water. Additionally, the chemical process itself does not break down the titanium oxide coating at all, allowing the wall to continuously clean up the smog as long as there is sunlight. Though whether or not it is going to keep its clean white appearance would be another matter to think about (unlike the Japanese-made panels shown on SmartPlanet); Personally, I think it should, given that it is going to filter more than 8000 cars’ worth of pollution per day.
Still, it is a good first step for the world to find some anti-smog solution, given how persistent that problem is around the world.
ps. Excuse me for the partial c&p from Giz, its explanation triumphs my own attempts.