India has six of the world's 10 most polluted cities, report shows
Chad in central Africa is the world’s most polluted country, while California has the worst air pollution in North America, according to an IQAir report.
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CNN
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India has six of the world's 10 most polluted cities, report shows (opens NBC Chicago)NBC Chicago's feed description
CBS News
Most polluted cities in the world — and the U.S. — revealed in annual report (opens CBS News)CBS News's feed description