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"Exposure to fine particles can cause short-term health effects such as eye, nose, throat and lung irritation, as well as coughing, sneezing, runny nose and shortness of breath," the guideline said.

"E-commerce is no longer a monolithic shopping channel, after years of blockbuster development in China," said Qi Zhe, an analyst at China International E-commerce Center.

"Father-sharing", a mini interactive program on WeChat platform, recently went viral on social media.

"Engaging local and international cities through a sister city agreement has been found to be effective in learning the different cultures of each of the cities and best practices," she said.

"Declining car sales may speed up the process of squeezing out the incompetent players and we may see some of them exit the market," said Cui.