Top 13 cleanest cities

• Here are the top 13 cleanest cities in the world:

1. Calgary, Canada
2. Honolulu, USA
3. Helsinki, Finland
4. Wellington, New Zealand
5. Kobe, Japan
6. Adelaide, Australia
7. Oslo, Norway
8. Minneapolis, USA
9. Copenhagen, Denmark
10. Stockholm, Sweden
11. Zurich, Switzerland
12. Vancouver, Canada
13. Kobe, Japan