The dirtiest city, Delhi; Smoke World & # 039: VIDEO

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Index of Air India: In the most polluted cities in the world, Delhi

April 6, 2015 Updated 17:09 BST

India has begun to monitor air quality in ten of their cities to fight in an effort to some of the worst air pollution in cities in the world.

Last year, the World Health Organization said 13 of the 20 most polluted cities in the world were in India - Delhi as the worst.

Some environmentalists have criticized the new air quality index, say simply measuring the concentration of pollutants is not enough.

The BBC reports Sanjoy Majumder in Delhi.

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