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A pedestrian covers her nose and mouth to protect herself from air pollution as she crosses the road in Hong Kong, China, 23 March 2010. The city is experiencing record levels of air pollution, in part caused by dust storms coming down from northern China, but also caused by roadside air pollutants emitted by diesel vehicles and ships, as well as industrial air pollution from factories in China's Guangdong Province. The Hong Kong Government has ordered all outdoor school activities in Hong Kong to be cancelled. EPA / ALEX HOFFORD