Nowadays, pollution is rampant in all major urban centres.

Fashionable : characteristic of, influenced by, or representing a current popular style.
Chronic : (of an illness) persisting for a long time or constantly recurring.
Deep-rooted : firmly embedded in thought, behaviour, or culture, and so having a persistent influence.
Widespread found or distributed over a large area or number of people.
Rampant : (especially of something unwelcome) flourishing or spreading unchecked.

Synonym of Rampant is Widespread