07 May, 2018 2018 WHO ranking of polluted cities explained, bad news for India The WHO reconfirms that several Indian cities have become death traps because of very high level of PM2.5 (particulate matter less than 2.5 micron size).
15 October, 2014 WHO says India ranks among the world's worst for its polluted air. Out of the 20 most polluted cities in the world, 13 are in India