Northeast China is under yet another smog emergency. It's also home to some of the world's most polluted cities.
Dzerzhinsk, Russia -- One of the Soviet Union's major sites for chemical weapons production, the Guinness Book of World Records named Dzerzhinsk the most chemically polluted city on Earth, and in 2003 its death rate exceeded its birth rate by 260 percent.
Jessica Rinaldi / Reuters
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