Causes of Pollution 

Find out more about the city you live in and its causes of air pollution: 

Delhi is the most polluted mega-city in the world, and 14 of the 15 most polluted cities in the world are in India. So what exactly is causing this pollution?

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Chicago is the 22nd most polluted city in the United States, moving up 4 spots from 26th just last year. Find out why.