Manila's experiment with 'purifying paint'
18 April 2012 Last updated at 03:34 BST
In the Philippine capital Manila, which is one of the most polluted cities in the world, a paint which it is claimed can purify the air is being used.
A local company has come up with the paint and in partnership with the government it is trying to use it to clean up one of the city's most smog-choked roads.
Kate McGeown reports from Manila.