I am sceptic of that listing. Normally, the bigger a city, the more waste it would accumulate. So why are almost all cities in China and India, ranked below? Save for two in India. Something is strange with that listing. Also if you do an image search on Google, Krakow is nowhere ugly or dirty. Yes, these images have a bias too, but compare it to the megacities in India. There is just no comparison here.