Northeast China is under yet another smog emergency. It's also home to some of the world's most polluted cities.
Norilsk, Russia -- Founded as a Siberian slave labor camp and home to the world's largest heavy metal smelting complex, an estimated 4 million tons of cadmium, copper, lead, nickel, arsenic, selenium and zinc are released into the air each year, according to Time. Mortality from respiratory diseases is much higher than Russia as a whole.
Ralf Manteufel/Wikimedia Commons
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