This picture taken on December 7, 2013 shows a model wearing a surgical mask as she parades a collection of gold jewelleries at a park in Nanjing, east China’s Jiangsu province. Cities across China have been hit by intense air pollution especially in winter months, much of it caused by emissions from coal-burning power stations, with PM 2.5 levels reaching as high as 40 times WHO limits, while the country’s rapid urbanisation, dramatic economic development and climatic factors, further worsen the condition. CHINA OUT AFP PHOTO