People wearing face masks ride motorcycles on a road in heavy smog in Ganyu county, Lianyungang city, east Chinas Jiangsu province, 8 December 2013. Chinese authorities have issued an orange alert as smog choked central and eastern China causing an increase in the number of people seeking treatment in hospitals for respiratory problems. The alert was on Saturday raised from yellow to the second-highest level on Chinas four-tier warning system for extreme weather, as the pollution reduced visibility to a soup, disrupted flights and caused many people to stay home. Jiangsu, Zhejiang, Anhui and Henan provinces have suffered smog for six consecutive days, the Xinhua news agency said, while other central and eastern regions have experienced three to five days. Nanjing, Jiangsus capital, was under a red alert, and Shanghai has been plagued by high levels of air polluti
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