To keep the city clean or as the best clean city in the world, people and Government organization (like corporation etc.) shall cooperate each other always beside few welfare organization that time to time does contribute to keep some clean city. We have to remember those organization as well even though they contribute when needed mostly.
There are many clean cities exists in the world but those cities name doesn't normally reflect in the survey report nor people really visited the city to accept it or ignored them just blindly following the few random report.
If you go to Far East countries like Singapore then you will accept it as one of the clean city in the world. If you go to Middle East countries like Abu Dhabi (in UAE) then you would agree it as one of the clean cities in the world. Riyadh (Saudi Arabia's capital) is one of the clean city in the world and you will definitely agree if you visit that place.
Other than these cities, there are some more clean cities in the world which already mentioned above. The natural cities like Calgary (Canada), Vienna (Austria), Luxembourg, Zurich (Switzerland ), Kyoto (Japan) etc. are the best in this category.
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