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The Pudong business district is shrouded by heavy air pollution in Shanghai on January 16, 2013. Several days of hazardous air quality across large swathes of northern China triggered an emergency response which saw schoolchildren kept indoors, factories closed and government cars parked. Experts are urging authorities to take firmer action to confront the consequences of China’s rapid industrialisation — and the spending habits of the middle classes created by its economic boom. AFP PHOTO/Mark RALSTON