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China's smog now 20 times worse than safe levels
Unit 8 - China's smog now 20 times worse than safe levels
Severe smog leaves China breathless
World Health Organization declares Beijing smog a crisis
China Now Has Cancer Causing 'Super Smog'
Unprecedented smog levels in Beijing
China's smog problem
Shanghai suffers the worst smog pollution ever
China: record smog levels shut down city of Harbin
China: Beijing suffers under smog for seventh day
China's smog problem affects world
Smog Shuts Down Chinese Megacity