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China's toxic smog - BBC News
China smog: 'Sky dark from air pollution' - BBC News
Chinese buy fresh air from Canada - BBC News
Toxic smog hangs over large swath of China
Dangerous smog levels choke China's Baoding
China's toxic smog problem
Winter brings China's worst smog of the year
China's smog now 20 times worse than safe levels
China smog: Environmental police to punish polluters
Chinese citizens losing patience with air pollution
Air quality in China: Pollution levels down by 42% over the past ten years • FRANCE 24 English
China's toxic smog BBC News