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China smog: 'Sky dark from air pollution' - BBC News
Beijing's air pollution goes off the scale
China's smog problem affects world
Toxic smog hangs over large swath of China
Heavy Smog Brings Travel Chaos to China
CHINA AIR POLLUTION
Chinese citizens losing patience with air pollution
Chinese capital being choked by smog
China's First-Ever Red Alert on Pollution Takes Effect in Beijing
Delhi smog: Crop-burning adds to pollution - BBC News
Thick air pollution fog blankets Chinese capital
Air pollution forces Chinese slowdown as cities close factories and ban flights
