10 World's Cleanest Cities

Calgary

Canada

Honolulu

Hawaii, USA

Wellington

New Zealand

Helsinki

Finland

Kobe

Japan

Adelaide

Australia

Zurich

Switzerland

Reykjavik

Iceland

Oslo

Norway

Copenhagen

Denmark

To keep their environments clean and sustainable, these cities have implemented a variety of initiatives and policies, such as encouraging recycling and composting, investing in public transportation, and regulating emissions.