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Indian city most polluted in the world

Last updated on: January 18, 2013 10:21 IST
Royal Palace is seen at the end of Karl Johans Gate in Oslo, Norway.

While pollution is a major problem in almost all cities, some are more polluted than others. According to United States's Environmental Protection Agency's air-quality index, one Indian city tops when it comes to pollution.

Let's take a look at some of the most polluted cities in the world's biggest economies.

Source: The Economist

NOTE: Environmental Protection Agency's air-quality index measures PM 2.5 (particulate matter of 2.5 microns across or less per cubic metre). Such particles are small enough to be inhaled and can damage lungs. The AQI range ends at 500. A reading above 100 is deemed "unhealthy for sensitive groups" and anything above 400 is rated "hazardous" for all, according to The Economist.

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Indian city most polluted in the world

Last updated on: January 18, 2013 10:21 IST
A view of Ludhiana, Punjab.

Ludhiana

Country: India

Particulate matter with diameter of 10 microns or less per cubic metre: 251

Global rank: 1

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Indian city most polluted in the world

Last updated on: January 18, 2013 10:21 IST
Railway station in Lanzhou, China.

Lanzhou

Country: China

Particulate matter with diameter of 10 microns or less per cubic metre: 150

Global rank: 2

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Indian city most polluted in the world

Last updated on: January 18, 2013 10:21 IST
House of Culture in Mexicali, Mexico.

Mexicali

Country: Mexico

Particulate matter with diameter of 10 microns or less per cubic metre: 139

Global rank: 3

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Indian city most polluted in the world

Last updated on: January 18, 2013 10:21 IST
Skyline of Medan, Indonesia.

Medan

Country: Indonesia

Particulate matter with diameter of 10 microns or less per cubic metre: 112

Global rank: 4

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Indian city most polluted in the world

Last updated on: January 18, 2013 10:21 IST
A view of Anyang from Suri mountain.

Anyang

Country: South Korea

Particulate matter with diameter of 10 microns or less per cubic metre: 68

Global rank: 5

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Indian city most polluted in the world

Last updated on: January 18, 2013 10:21 IST
Busan, South Korea.

Busan

Country: South Korea

Particulate matter with diameter of 10 microns or less per cubic metre: 68

Global rank: 6

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Indian city most polluted in the world

Last updated on: January 18, 2013 10:21 IST
Cityscape of Johannesburg in South Africa.

Johannesburg

Country: South Africa

Particulate matter with diameter of 10 microns or less per cubic metre: 64

Global rank: 7

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Indian city most polluted in the world

Last updated on: January 18, 2013 10:21 IST
An aerial view of the famous Christ the Redeemer atop of Corcovado mountain in Rio de Janeiro.

Rio de Janeiro

Country: Brazil

Particulate matter with diameter of 10 microns or less per cubic metre: 62

Global rank: 8

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Indian city most polluted in the world

Last updated on: January 18, 2013 10:21 IST
A view of rose garden at Palace of Venaria Reale in Turin.

Turin

Country: Italy

Particulate matter with diameter of 10 microns or less per cubic metre: 46

Global rank: 9

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Indian city most polluted in the world

Last updated on: January 18, 2013 10:21 IST
A souvenir shop in the Andalusian capital of Seville.

Seville

Country: Spain

Particulate matter with diameter of 10 microns or less per cubic metre: 44

Global rank: 10

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Indian city most polluted in the world

Last updated on: January 18, 2013 10:21 IST
A view of Zaragoza.

Zaragoza

Country: Spain

Particulate matter with diameter of 10 microns or less per cubic metre: 44

Global rank: 11

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Indian city most polluted in the world

Last updated on: January 18, 2013 10:21 IST
People skate on an artivicial ice rink across from the Eiffel Tower in Paris.

Paris

Country: France

Particulate matter with diameter of 10 microns or less per cubic metre: 38

Global rank: 12

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Indian city most polluted in the world

Last updated on: January 18, 2013 10:21 IST
A view of Bakersfield, California.

Bakersfield, California

Country: The United States

Particulate matter with diameter of 10 microns or less per cubic metre: 38

Global rank: 13

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Indian city most polluted in the world

Last updated on: January 18, 2013 10:21 IST
Montreal Canadiens' hockey team jerseys hang outside a shop in Vieux-Port in Montreal.

Montreal

Country: Canada

Particulate matter with diameter of 10 microns or less per cubic metre: 36

Global rank: 14

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Indian city most polluted in the world

Last updated on: January 18, 2013 10:21 IST
A view of Moscow business district.

Moscow

Country: Russia

Particulate matter with diameter of 10 microns or less per cubic metre: 35

Global rank: 15

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Indian city most polluted in the world

Last updated on: January 18, 2013 10:21 IST
A view of Striezelmarkt Christmas market in Dresden.

Dresden

Country: Germany

Particulate matter with diameter of 10 microns or less per cubic metre: 34

Global rank: 16

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Indian city most polluted in the world

Last updated on: January 18, 2013 10:21 IST
King's Cross station in London.

London

Country: The United Kingdom

Particulate matter with diameter of 10 microns or less per cubic metre: 33

Global rank: 17

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Indian city most polluted in the world

Last updated on: January 18, 2013 10:21 IST
Dotonbori shopping and amusement district in Osaka.

Osaka

Country: Japan

Particulate matter with diameter of 10 microns or less per cubic metre: 25

Global rank: 18

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Indian city most polluted in the world

Last updated on: January 18, 2013 10:21 IST
Brisbane River is seen flowing past the skyline of central Brisbane.

Brisbane

Country: Australia

Particulate matter with diameter of 10 microns or less per cubic metre: 18

Global rank: 19