The Delhi entrepreneur hoping to clean up the world's most polluted city

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In 2014, Delhi was named the most polluted city in the world by the World Health Organisation. The city adds about 1,400 cars to its roads every single day, and with most of them running on a less refined form of diesel than is available in other more developed economies, the level of tiny, toxic particles in the air has fast become a major health hazard. The BBC's Anu Anand took a tour of what claims to be the only green building in Delhi, one that not only cleans its incoming air but is certified energy efficient by some of the world's leading authorities. Baran Agrawal, director of BreatheEasy Labs, a company that sells air purifiers, showed her around. (Picture: A smoking chimney in Delhi. Picture Credit: Associated Press.)