Northeast China is under yet another smog emergency. It's also home to some of the world's most polluted cities.
Kabwe, Zambia -- Rich deposits of lead were found here in 1902, and while most mines and smelters are no longer operating, lead concentrations in children are five to 10 times the permissible U.S. Environmental Protection Agency levels, and can even be high enough to kill, according to Time.
Pete Souza/White House Photo
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