Check out this technology from Boral. Very cool idea!
Uploaded by BoralRoofing on Dec 15, 2010
SMOG-EATING Tile is the first of-its-kind product in sustainable concrete roofing tiles that reduces the formation of smog. The revolutionary SMOG-EATING Tile can be installed on both new residential and commercial buildings, as well as re-roofing projects. The only concrete tile roofing solution in the U.S. that mitigates air pollution, SMOG-EATING Tile represents one means for builders and consumers alike to protect the environment.