A Stockholm-based company have been researching catalytic cement and concrete materials. Essentially they aim to make buildings and roads actually clean the air.
This is not a new idea but the technology being researched is newly discovered nanotechnologies.
“In Rome, the Dives in Misericordia church, designed by U.S.-based architect Richard Meier, is made of self-cleaning concrete that helps keep the surface shiny white. In Japan, several modern buildings including the Marunouchi Building in downtown Tokyo, are covered with photocatalytic tiles to reduce discoloring from pollution.”