New weapon in fight against smog

From catalytic converters to alternative fuels, the fight against big-city smog has for years been fought inside combustion engines and exhaust pipes.

Now, scientists are taking the fight to the streets by developing “smart” building materials designed to clean the air with a little help from the elements.

Using technology already available for self-cleaning windows and bathroom tiles, scientists hope to paint up cities with materials that dissolve and wash away pollutants when exposed to sun and rain.

CNN