Popular Science - In 2011 You'll Never Have to Clean Your House Again:
"Not so long ago, chemical engineers discovered how to use titanium dioxide to keep buildings free of discoloring pollution. Landmarks such as the virgin-white Dives in Misericordia Church in Rome and the Marunouchi Building in Tokyo were among the first to be coated with the semiconductor, which breaks down organic molecules—including those in grime and pollution—when exposed to light and water and then releases them into the air. Soon after, TiO2-based self-cleaning products, like SunClean windows from PPG Industries, hit the home market."
LINKS: Institute for Nanoscale Technology
