Northeast China is under yet another smog emergency. It's also home to some of the world's most polluted cities.
Tianying, China -- This city in China's Anhui province is one of the centers of the nation's lead mining and processing industry. Small-scale operations are notorious for disobeying regulations, causing lead concentrations in the air and soil to be 8.5 to 10 times higher than the national health standard. Many residents are reported to suffer fro lead poisoning.
Jessica Rinaldi / Reuters
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