Yes, pollution is shortening countries' selfie spans. Looking specifically at the most polluted city in the world, New Delhi, a study by the energy policy institute at the University of Chicago reported that "New Delhi, India's capital, has been ranked the world's most polluted city, where people have lost almost 10 years of their lives to air pollution". The levels of pollution in this area are reported to be 10 times higher then the safe limit, and are already causing heart and respiratory issues.
India has such bad pollution that globally, 44% of the world's pollution has come from there. Hopefully with lots of increased effort environmentally friendly methods, India can switch its ways and become healthier.