CNN
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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 cities – 13 – are in the world’s most populous country, India, where booming economic growth is fired largely by coal and where hundreds of millions live in traffic-clogged and congested megacities.
Another four are in neighboring Pakistan, with one in China and Kazakhstan respectively.
The only city outside of Asia featured on the list is N’Djamena, the capital of Chad in central Africa – which was named the country with the worst air pollution.
Meanwhile the cities with the worst…
