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Indian city most polluted in the world

Last updated on: January 18, 2013 10:21 IST

Image: Royal Palace is seen at the end of Karl Johans Gate in Oslo, Norway.
Photographs: Suzanne Plunkett/Reuters

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

Image: A view of Ludhiana, Punjab.
Photographs: Source: Soman/Wikipedia Commons

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

Image: Railway station in Lanzhou, China.
Photographs: Source: Chen Zhao/Wikipedia Commons

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

Image: House of Culture in Mexicali, Mexico.
Photographs: Source: Thelmadatter/Wikipedia Commons

Mexicali

Country: Mexico

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

Global rank: 3

...

Indian city most polluted in the world

Image: Skyline of Medan, Indonesia.
Photographs: Source: Kenrick95/Wikipedia Commons

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

Image: A view of Anyang from Suri mountain.
Photographs: Source: Hyungyong Kim/Wikipedia Commons

Anyang

Country: South Korea

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

Global rank: 5

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Tags: , South Korea

Indian city most polluted in the world

Image: Busan, South Korea.
Photographs: Source: byseaninjapan/Wikipedia Commons

Busan

Country: South Korea

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

Global rank: 6

...

Indian city most polluted in the world

Image: Cityscape of Johannesburg in South Africa.
Photographs: Euroluftbild.de Euroluftbild.de/Reuters

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

Image: An aerial view of the famous Christ the Redeemer atop of Corcovado mountain in Rio de Janeiro.
Photographs: Bruno Domingos/Reuters

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

Image: A view of rose garden at Palace of Venaria Reale in Turin.
Photographs: Alessandro Garofalo/Reuters

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

Image: A souvenir shop in the Andalusian capital of Seville.
Photographs: Marcelo del Pozo/Reuters

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

Image: A view of Zaragoza.
Photographs: Source: Wikipedia Commons

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

Image: People skate on an artivicial ice rink across from the Eiffel Tower in Paris.
Photographs: Charles Platiau/Reuters

Paris

Country: France

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

Global rank: 12

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Tags: , Paris

Indian city most polluted in the world

Image: A view of Bakersfield, California.
Photographs: Source: Bobak Ha'Eri/Wikipedia Commons

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

Image: Montreal Canadiens' hockey team jerseys hang outside a shop in Vieux-Port in Montreal.
Photographs: Jumana El-Heloueh/Reuters

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

Image: A view of Moscow business district.
Photographs: Denis Sinyakov/Reuters

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

Image: A view of Striezelmarkt Christmas market in Dresden.
Photographs: Tobias Schwarz/Reuters

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

Image: King's Cross station in London.
Photographs: Paul Hackett/Reuters

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

Image: Dotonbori shopping and amusement district in Osaka.
Photographs: Issei Kato/Reuters

Osaka

Country: Japan

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

Global rank: 18

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Tags: , Osaka , Japan

Indian city most polluted in the world

Image: Brisbane River is seen flowing past the skyline of central Brisbane.
Photographs: Mick Tsikas/Reuters

Brisbane

Country: Australia

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

Global rank: 19