Our lungs, the first respondents to the air pollution crisis, are no longer pink. It is spottled black and grey. Learn how risky the air is from the eye-opening revelations of Dr Arvind Kumar, Chairman of the Institute of Chest Surgery at Medanta Hospital and founder of the Lung Care Foundation. An earnest, true-to-his-discipline doctor, he opens up the issue for a better public understanding. One can survive without food for about 21 days and without water for about five days. But without air,......