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25 most polluted cities in the world

USA TODAY Logo By 24/7 Wall Street of USA TODAY | Slide 1 of 26: imageforentry140.jpg

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25. Zhengzhou, China     • Population: 4.5 million     • Average PM2.5 pollution per cubic meter: 86 micrograms     • Average PM10 pollution per cubic meter: 171 micrograms     Zhengzhou is one of the largest manufacturing centers in China. The Henan Province capital is famously home to a massive quarter-million worker Foxconn manufacturing center, among other manufacturers. More than one in every 10 smartphones in the world are built in Zhengzhou. Not surprisingly, the industrial hub is also one of the most polluted cities on earth.
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