Vehicular pollution, construction dust, diesel generators are a common problem in almost all big cities in India.

However you are looking at the advantages of villages as a visitor with a point of view towards being closer to nature. There are other problems in villages that you probably won't encounter unless you live there on a day to day basis. Finally, grass is always greener on the other side (holds true for both villages & city dwellers).

> A large number of people need to die due to cancer for it be taken seriously

Cancer isn't uncommon in villages and city pollution isn't the only cause.