But many cities from these states also face high pollution.
Noida, Ghaziabad (UP), Gurugram (Haryana) are a few examples which are highly populated. Noida is slowly growing as UP's manufactoring hub, already being its IT hub. Gurugram is another IT hub.
A lot of this problem is also because of the apathy of the working class who reside in these cities.
We have to learn the art of activism :(