[Fakira]

The population density of Delhi is 29K people per sq mile which is one of the highest in the world. Tokyo, for example, has a population density of 16k.

India's population density is not really a problem though, the problem is lack of urbanization and absolutely horrible California like land regulations that prevent building new cities and infrastructure.

Delhi's pollution is not caused by Delhi, it is caused by neighboring farming zones that burn the stubble.