Vienna, Austria
Vienna is also known to be the best city to live in the world as it has a clean environment and negligible pollution. Vienna, the capital of Austria, has an efficient system of generating energy from waste. The public transportation system also helps in reducing pollution of every kind. People are caring and do not litter of streets. With a population of 1.8 million, Vienna remains as one of the cleanest cities in the world in 2015.
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