More pollution sources like cars, factories, etc.
I think that if a city's population is really high then it is more likely to be polluted. Hope this helped :)
Yes,it is polluted. In fact all the cities are polluted. The pollution levels are same as many big cities like London,new york etc..
Rome, Paris, Athens, London and Florence are Europe's most polluted cities.
mexico city is the capital of mexico and one of the most polluted cities
Milwaukee is the most polluted city because of the industry.
Mmm I would say Britain is more pulluted because of it's high urban population. However Athens as an exception is exceedingly polluted, but London is polluted 2. I think both Cities have improved vastly though. But because Greece is much more rural, I would say it is less polluted.
tokio in japan
Sumagot kayo!
china
bombay
When a village gets very, very large they call it first a town, finally a city.
more polluted, most polluted