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Before the pandemic, the subway ran 24 hours a day. Now, the system is closed each night between 1 am and 5 am to clean stations and subway cars.

Beijing currently has 50,000 hectares of wetlands. By 2020, it plans to add another 3,000 hectares. The green-zone coverage will be at least 30 percent by then, according to the government plan.

Beijing Techina CSC Science&Technology Service promoted L'ontologie, a system developed for evaluation. [Photo provided to chinadaily.com.cn]

Beijing has 1,070 AI companies, accounting for 26 percent of the national total, according to a report on Beijing AI industry development, released by the Beijing Municipal Commission of Economy and Information Technology (BMCEIT) at the 22nd China International Software Expo on Saturday.

Beijing's historic and cultural attractions of Qianmen Street, Wangfujing, the Summer Palace, the Temple of Heaven and the Forbidden City were among the most popular destinations for visitors.