World's most polluted cities
Take a look at some of the world's most polluted cities, as ranked and compiled by Time, the Blacksmith Institute and ABC Environment.
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.
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