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Beijing's population fell by 6,000, or 0.03 percent, last year, but remained around 21.5 million.

Beer lovers gather in the coastal city of Qingdao in Shandong province for the annual international beer festival, which runs through Sunday. [Photo provided to China Daily]

Before the expo, Baidu and Cangzhou municipal government reached an agreement to work together on technologies of artificial intelligence, self-driving, cloud computing and big data to build a "smart Cangzhou."

Beijing has adopted measures to ensure vegetable supplies for its residents after the Xinfadi wholesale market suspended operations due to the detection of a local cluster of COVID-19 infections in June.

Beijing is speeding up the process of replacing its 70,000 taxis with NEVs after the municipal government issued a plan to combat air pollution in 2018, which said public vehicles would be converted to electric ones.