The following is accurate according to an scientific report published in Nature:
Nature 525, 367–371 (17 September 2015) doi:10.1038/nature15371 Received 10 May 2014 Accepted 27 July 2015 Published online 16 September 2015. http://www.nature.com/nature/journal/v525/n7569/full/nature15371.html
Scientists from Harvard University and other countries such as Cyprus and Germany measured the most detailed estimates yet of the toll of air pollution, in a quest to find the cause. The study found that air pollution is killing 3.3 million people a year worldwide, that is divided as such:
China: 1,400,00 deaths/year.
India: 645,000 deaths/year.
Pakistan: 110,000 deaths/year.
The study also predicted that the yearly death total will double to about 6.6 million a year by 2050.