<https://www.newsdirectory3.com/delhi-is-the-most-polluted-metropolis-in-the-entire-world-followed-by-kolkata-delhi-tops-the-list-of-most-polluted-cities-in-the-earth/>
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<https://www.newsdirectory3.com/delhi-is-the-most-polluted-metropolis-in-the-entire-world-followed-by-kolkata-delhi-tops-the-list-of-most-polluted-cities-in-the-earth/>