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Compared with electric vehicles, natural gas vehicles are more economical, said Wei Honglian, an official in charge of the vehicle emissions department at the Ministry of Environmental Protection.

Co-hosted by China's Ministry of Culture and Tourism and the Shanghai government, the expo has attracted over 350 companies from home and abroad.

Commanders of the Revolutionary Armed Forces of Colombia (FARC) and now members of the political party Revolutionary Alternative Common Force (FARC), attend a news conference in Bogota, Colombia, on Aug 29, 2019. [Photo/Agencies]

Commenting on criticisms of the motivations of Beijing with this initiative, the Ambassador said: "The logic of the BRI is not about seeking supremacy. In history, we had the ancient Silk Road, a symbol for openness and mutual learning. The BRI aims to revive that spirit...The BRI aims to offer a solution to global challenges and an open platform for global cooperation. It focuses on connectivity, and would hopefully give a boost to global growth."

Coal burning is no longer a major source of PM2.5 - particulate matter less than 2.5 micrometres in diameter - in Beijing, according to a study published last month by the Beijing Environmental Protection Bureau.