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Beijing has a four-tier color alert system for pollution, with red being the highest, followed by orange, yellow and blue. The blue alert means the air quality index is forecast to reach between 200 and 300 PM2.5 for one day.

China witnessed a boom of electric vehicle investment in the past few years largely thanks to government's incentives.

Dai, a graduate of Peking University, deployed the first batch of ofo bikes on campus in September, 2015 and the idea was an instant hit.

In January alone, Zhejiang reported 35 infections of the H7N9 strain of bird flu. Contact with live poultry is the major source of infection, particularly in rural areas.

The "16+1" refers to China and the 16 Central and Eastern European countries (CEEC).