Indian city most polluted in the world
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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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Image: Royal Palace is seen at the end of Karl Johans Gate in Oslo, Norway.
Photographs: Suzanne Plunkett/Reuters
Indian city most polluted in the world
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Ludhiana
Country: India
Particulate matter with diameter of 10 microns or less per cubic metre: 251
Global rank: 1
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Image: A view of Ludhiana, Punjab.
Photographs: Source: Soman/Wikipedia Commons
Indian city most polluted in the world
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Lanzhou
Country: China
Particulate matter with diameter of 10 microns or less per cubic metre: 150
Global rank: 2
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Image: Railway station in Lanzhou, China.
Photographs: Source: Chen Zhao/Wikipedia Commons
Indian city most polluted in the world
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Mexicali
Country: Mexico
Particulate matter with diameter of 10 microns or less per cubic metre: 139
Global rank: 3
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Image: House of Culture in Mexicali, Mexico.
Photographs: Source: Thelmadatter/Wikipedia Commons
Indian city most polluted in the world
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Medan
Country: Indonesia
Particulate matter with diameter of 10 microns or less per cubic metre: 112
Global rank: 4
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Image: Skyline of Medan, Indonesia.
Photographs: Source: Kenrick95/Wikipedia Commons
Indian city most polluted in the world
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Anyang
Country: South Korea
Particulate matter with diameter of 10 microns or less per cubic metre: 68
Global rank: 5
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Image: A view of Anyang from Suri mountain.
Photographs: Source: Hyungyong Kim/Wikipedia Commons
Indian city most polluted in the world
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Busan
Country: South Korea
Particulate matter with diameter of 10 microns or less per cubic metre: 68
Global rank: 6
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Image: Busan, South Korea.
Photographs: Source: byseaninjapan/Wikipedia Commons
Indian city most polluted in the world
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Johannesburg
Country: South Africa
Particulate matter with diameter of 10 microns or less per cubic metre: 64
Global rank: 7
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Image: Cityscape of Johannesburg in South Africa.
Photographs: Euroluftbild.de Euroluftbild.de/Reuters
Indian city most polluted in the world
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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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Image: An aerial view of the famous Christ the Redeemer atop of Corcovado mountain in Rio de Janeiro.
Photographs: Bruno Domingos/Reuters
Indian city most polluted in the world
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Turin
Country: Italy
Particulate matter with diameter of 10 microns or less per cubic metre: 46
Global rank: 9
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Image: A view of rose garden at Palace of Venaria Reale in Turin.
Photographs: Alessandro Garofalo/Reuters
Indian city most polluted in the world
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Seville
Country: Spain
Particulate matter with diameter of 10 microns or less per cubic metre: 44
Global rank: 10
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Image: A souvenir shop in the Andalusian capital of Seville.
Photographs: Marcelo del Pozo/Reuters
Indian city most polluted in the world
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Zaragoza
Country: Spain
Particulate matter with diameter of 10 microns or less per cubic metre: 44
Global rank: 11
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Image: A view of Zaragoza.
Photographs: Source: Wikipedia Commons
Indian city most polluted in the world
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Paris
Country: France
Particulate matter with diameter of 10 microns or less per cubic metre: 38
Global rank: 12
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Image: People skate on an artivicial ice rink across from the Eiffel Tower in Paris.
Photographs: Charles Platiau/Reuters
Indian city most polluted in the world
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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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Image: A view of Bakersfield, California.
Photographs: Source: Bobak Ha'Eri/Wikipedia Commons
Indian city most polluted in the world
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Montreal
Country: Canada
Particulate matter with diameter of 10 microns or less per cubic metre: 36
Global rank: 14
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Image: Montreal Canadiens' hockey team jerseys hang outside a shop in Vieux-Port in Montreal.
Photographs: Jumana El-Heloueh/Reuters
Indian city most polluted in the world
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Moscow
Country: Russia
Particulate matter with diameter of 10 microns or less per cubic metre: 35
Global rank: 15
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Image: A view of Moscow business district.
Photographs: Denis Sinyakov/Reuters
Indian city most polluted in the world
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Dresden
Country: Germany
Particulate matter with diameter of 10 microns or less per cubic metre: 34
Global rank: 16
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Image: A view of Striezelmarkt Christmas market in Dresden.
Photographs: Tobias Schwarz/Reuters
Indian city most polluted in the world
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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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Image: King's Cross station in London.
Photographs: Paul Hackett/Reuters
Indian city most polluted in the world
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Osaka
Country: Japan
Particulate matter with diameter of 10 microns or less per cubic metre: 25
Global rank: 18
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Image: Dotonbori shopping and amusement district in Osaka.
Photographs: Issei Kato/Reuters
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