The 30 Cleanest Cities in the World

Vienna, Austria

The capital and largest city of Austria, Vienna has a population of about 1.8 million, but the city regularly ranks among the cleanest cities in the world. Vienna has invested huge amounts of money into its waste disposal systems over the past decades, and it has been paying off. Moreover, local people are very environmentally-conscious and they help the authorities to keep their city spotlessly clean and tidy.