Northeast China is under yet another smog emergency. It's also home to some of the world's most polluted cities.
Central Kalimantan province, Indonesia -- According to ABC Environment, the largest concentration of people at risk from mercury pollution is in Indonesia. In Borneo's Central Kalimantan province, mercury is used to extract gold from ore, a process is estimated to release 99,000 pounds of mercury into the environment each year
Pete Souza/White House Photo
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