World's 20 most polluted cities largely in Asia
All but one of the world's top 20 most polluted cities last year were in Asia, a new study shows. CNN's Dhruv Tikekar reports.
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The list of the world’s top 20 most polluted cities is out. All but one are in Asia
All but one of the world’s top 20 most polluted cities last year were in Asia, a new study shows. The majority of these ...