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The photo taken on Feb. 17, 2011 shows an aerial view of fog-shrouded Haikou in Hainan Province, south China. A "yellow" fog alert was issued in Haikou on Thursday. China has a color-coded weather warning system: red, orange, yellow and blue. Blue is the least serious level. [Xinhua]
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![The photo taken on Feb. 17, 2011 shows an aerial view of fog-shrouded Haikou in Hainan Province, south China. A 'yellow' fog alert was issued in Haikou on Thursday. China has a color-coded weather warning system: red, orange, yellow and blue. Blue is the least serious level. [Xinhua]](http://images.china.cn/attachement/jpg/site1007/20110217/0014222d98500ec71a410e.jpg "The photo taken on Feb. 17, 2011 shows an aerial view of fog-shrouded Haikou in Hainan Province, south China. A 'yellow' fog alert was issued in Haikou on Thursday. China has a color-coded weather warning system: red, orange, yellow and blue. Blue is the least serious level. [Xinhua]")
