Although Asia is traditionally the continent with the dirtiest cities, in the top 4 there is a city that was once famous for its cleanliness. But times have changed and this top American city is at the level of an Indian metropolis.

The most polluted cities in the world:

1. Delhi
2. Beijing
3. Lima
4. Seattle
5. Karachi
6. Dubai
7. Tashkent
8. Wuhan
9. Kuwait
10. Kolkata

Europe remains the cleanest continent with the exception of the continent where there is no industry or population - Antarctica.

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