Mercer, a New-York based human resource and related financial services consulting firm, published its Eco-city rankings 2010. Eco-City Ranking 2010 includes the following criteria: water availability, water potability, waste removal, sewage, air pollution and traffic congestion.

Mercer, a New-York based human resource and related financial services consulting firm, published its Eco-city rankings 2010. Eco-City Ranking 2010 includes the following criteria: water availability, water potability, waste removal, sewage, air pollution and traffic congestion. Calgary, Canada, is the world's top in the ranking.

It is followed by Honolulu, Hawaii.

Ottawa, the capital of Canada, holds the third position.

Helsinki, the capital of Finland, shares the third position.

Wellington, the capital of New Zealand, retains the fifth spot.

Adelaide, South Australia, holds the seventh place.

It is followed by Copenhagen, the capital of Denmark.

…Oslo, the capital of Norway…

… and Stockholm, the capital of Sweden.
