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12 cleanest cities of the world

Last updated on: July 17, 2014 16:04 IST
Tourists walk past statues along the Singapore river, with the financial district in the background.

MBC Times recently came up with a list of 12 cleanest cities of the world.

While culling the list, a quality of life surveys was taken into account along with factors such as water availability, waste removal, sewage systems, air pollution and traffic density.

Here goes the list:

Rank 10: Singapore

Area: 274.1 sq miles (710 km²)

Population: 5.312 million

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12 cleanest cities of the world

Last updated on: July 17, 2014 16:04 IST
A woman carries firewood through a forest near Ifrane in the Middle Atlas region of Morocco.

Rank 2: Ifrane, Morocco

Population: 40,104

Elevation: 5,460 ft (1,665 m)

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12 cleanest cities of the world

Last updated on: July 17, 2014 16:04 IST
People walk in downtown Helsinki.

Rank 3: Helsinki, Finland

Area: 72.24 sq miles (187.1 km²)

Founded: 1550

Population: 614,074.

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12 cleanest cities of the world

Last updated on: July 17, 2014 16:04 IST
A large crowd gathers to release and watch floating lanterns on the water after being released during a ceremony marking remembrance and reflection, held by Shinnyo-en Buddhists honoring victims of war, famine, and natural disasters on Memorial Day, at Ala Moana Beach Park in Honolulu.

Rank 4: Honolulu, Hawaii

Area: 68.42 sq miles (177.2 km²)

Population: 374,658 (2009).

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12 cleanest cities of the world

Last updated on: July 17, 2014 16:04 IST
The Wellington Cable Car is seen ascending with a view of the city in the background.

Rank 5: Wellington, New Zealand

Area: 112 sq miles (290 km²)

Population: 200,100.

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12 cleanest cities of the world

Last updated on: July 17, 2014 16:04 IST
Elder Park in Adelaide.

Rank 6: Adelaide, Australia

Area: 213.2 sq miles (552.3 km²)

Population: 1.544 million.

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12 cleanest cities of the world

Last updated on: July 17, 2014 16:04 IST
An aerial view of the western Japanese port city of Kobe.

Rank 7: Kobe, Japan

Area: 213.2 sq miles (552.3 km²)

Population: 1.544 million (2010).

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12 cleanest cities of the world

Last updated on: July 17, 2014 16:04 IST
A woman walks past the Supreme Court of Canada in Ottawa.

Rank 8: Ottawa, Canada

Area: 1,073 sq miles (2,778 km²)

Population: 883,391 (2011).

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12 cleanest cities of the world

Last updated on: July 17, 2014 16:04 IST
A general view shows the city of Reykjavik seen from Hallgrimskirkja church.

Rank 9: Reykjavik, Iceland

Area: 106 sq miles (274.5 km²)

Founded: 1786

Population: 118,488.

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12 cleanest cities of the world

Last updated on: July 17, 2014 16:04 IST
A cowboy walks by a carnival ride during day two of the Calgary Stampede in Calgar.

Rank 1: Calgary, Canada

Area: 280.5 sq miles (726.5 km²)

Population: 988,195 (2006)

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12 cleanest cities of the world

Last updated on: July 17, 2014 16:04 IST
The city of Curitiba, Brazil.

Rank 11: Curitiba, Brazil

Area: 166.4 sq miles (430.9 km²)

Population: 1.752 million (2010).

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12 cleanest cities of the world

Last updated on: July 17, 2014 16:04 IST
The Brisbane River is seen flowing past the skyline of central Brisbane.

Rank 12: Brisbane, Australia

Area: 2,297 sq miles (5,950 km²)

Founded: 1824

Population: 2.043 million