India's pollution levels are not industrial or vehicular - they are agriculture waste burning. And they are timed with agricultural harvesting cycles.
We have super fragmented farmlands who are really poor and this causes bad practices of disposal .
We are a service based economy - but to be able to bring the bottom of the pyramid out of poverty, we need to accelerate manufacturing and bring modernisation into agriculture. Not to mention education.
15 and 10 year is for privately owned vehicles
India will have a special challenge from mosquitoes and diseases like dengue and malaria, but maybe the best approach to malaria will be turning mosquito-borne diseases into diseases of the rich. We probably can't fully appreciate the solutions a wealthy India (or wealthy Nigeria) would develop, applying new resources, the latest science, and metis to deal with the world's deadliest animal.
[0] https://www.gatesnotes.com/Books/Factfulness#
[1] https://www.gatesnotes.com/Health/Most-Lethal-Animal-Mosquit...
In cities like Delhi and Mumbai, none of these is major reason. Pollution from vehicles (especially diesel vehicles), crop waste burning (esp in areas around Delhi) and industrial pollution are the major reasons. These cities are too densed and yet too big.
The sad thing is that there are hundreds of laws to prevent pollution but law enforcement is not a thing in India.
One easy way to bring these people out of poverty is to provide them with good economic opportunities (like factory jobs!). High-tech factories would demand cleaner, more stable power (natural gas, nuclear instead of coal, wood, cow dung).
2) India's totally overpopulated, agreed. One way to decrease the population growth is to bring these people out of poverty. Every developed country has seen their birth rate decline once they move to the middle class. These guys need jobs, college, etc, and people will start having less kids!